deletion completed and false if user_id is not a number.
 */
function delete_usermeta( $user_id, $meta_key, $meta_value = '' ) {
	_deprecated_function( __FUNCTION__, '3.0.0', 'delete_user_meta()' );
	global $wpdb;
	if ( !is_numeric( $user_id ) )
		return false;
	$meta_key = preg_replace('|[^a-z0-9_]|i', '', $meta_key);

	if ( is_array($meta_value) || is_object($meta_value) )
		$meta_value = serialize($meta_value);
	$meta_value = trim( $meta_value );

	$cur = $wpdb->get_row( $wpdb->prepare("SELECT * FROM $wpdb->usermeta WHERE user_id = %d AND meta_key = %s", $user_id, $meta_key) );

	if ( $cur && $cur->umeta_id )
		do_action( 'delete_usermeta', $cur->umeta_id, $user_id, $meta_key, $meta_value );

	if ( ! empty($meta_value) )
		$wpdb->query( $wpdb->prepare("DELETE FROM $wpdb->usermeta WHERE user_id = %d AND meta_key = %s AND meta_value = %s", $user_id, $meta_key, $meta_value) );
	else
		$wpdb->query( $wpdb->prepare("DELETE FROM $wpdb->usermeta WHERE user_id = %d AND meta_key = %s", $user_id, $meta_key) );

	clean_user_cache( $user_id );
	wp_cache_delete( $user_id, 'user_meta' );

	if ( $cur && $cur->umeta_id )
		do_action( 'deleted_usermeta', $cur->umeta_id, $user_id, $meta_key, $meta_value );

	return true;
}

/**
 * Retrieve user metadata.
 *
 * If $user_id is not a number, then the function will fail over with a 'false'
 * boolean return value. Other returned values depend on whether there is only
 * one item to be returned, which be that single item type. If there is more
 * than one metadata value, then it will be list of metadata values.
 *
 * @since 2.0.0
 * @deprecated 3.0.0 Use get_user_meta()
 * @see get_user_meta()
 *
 * @param int $user_id User ID
 * @param string $meta_key Optional. Metadata key.
 * @return mixed
 */
function get_usermeta( $user_id, $meta_key = '' ) {
	_deprecated_function( __FUNCTION__, '3.0.0', 'get_user_meta()' );
	global $wpdb;
	$user_id = (int) $user_id;

	if ( !$user_id )
		return false;

	if ( !empty($meta_key) ) {
		$meta_key = preg_replace('|[^a-z0-9_]|i', '', $meta_key);
		$user = wp_cache_get($user_id, 'users');
		// Check the cached user object
		if ( false !== $user && isset($user->$meta_key) )
			$metas = array($user->$meta_key);
		else
			$metas = $wpdb->get_col( $wpdb->prepare("SELECT meta_value FROM $wpdb->usermeta WHERE user_id = %d AND meta_key = %s", $user_id, $meta_key) );
	} else {
		$metas = $wpdb->get_col( $wpdb->prepare("SELECT meta_value FROM $wpdb->usermeta WHERE user_id = %d", $user_id) );
	}

	if ( empty($metas) ) {
		if ( empty($meta_key) )
			return array();
		else
			return '';
	}

	$metas = array_map('maybe_unserialize', $metas);

	if ( count($metas) == 1 )
		return $metas[0];
	else
		return $metas;
}

/**
 * Update metadata of user.
 *
 * There is no need to serialize values, they will be serialized if it is
 * needed. The metadata key can only be a string with underscores. All else will
 * be removed.
 *
 * Will remove the metadata, if the meta value is empty.
 *
 * @since 2.0.0
 * @deprecated 3.0.0 Use update_user_meta()
 * @see update_user_meta()
 *
 * @param int $user_id User ID
 * @param string $meta_key Metadata key.
 * @param mixed $meta_value Metadata value.
 * @return bool True on successful update, false on failure.
 */
function update_usermeta( $user_id, $meta_key, $meta_value ) {
	_deprecated_function( __FUNCTION__, '3.0.0', 'update_user_meta()' );
	global $wpdb;
	if ( !is_numeric( $user_id ) )
		return false;
	$meta_key = preg_replace('|[^a-z0-9_]|i', '', $meta_key);

	/** @todo Might need fix because usermeta data is assumed to be already escaped */
	if ( is_string($meta_value) )
		$meta_value = stripslashes($meta_value);
	$meta_value = maybe_serialize($meta_value);

	if (empty($meta_value)) {
		return delete_usermeta($user_id, $meta_key);
	}

	$cur = $wpdb->get_row( $wpdb->prepare("SELECT * FROM $wpdb->usermeta WHERE user_id = %d AND meta_key = %s", $user_id, $meta_key) );

	if ( $cur )
		do_action( 'update_usermeta', $cur->umeta_id, $user_id, $meta_key, $meta_value );

	if ( !$cur )
		$wpdb->insert($wpdb->usermeta, compact('user_id', 'meta_key', 'meta_value') );
	elseif ( $cur->meta_value != $meta_value )
		$wpdb->update($wpdb->usermeta, compact('meta_value'), compact('user_id', 'meta_key') );
	else
		return false;

	clean_user_cache( $user_id );
	wp_cache_delete( $user_id, 'user_meta' );

	if ( !$cur )
		do_action( 'added_usermeta', $wpdb->insert_id, $user_id, $meta_key, $meta_value );
	else
		do_action( 'updated_usermeta', $cur->umeta_id, $user_id, $meta_key, $meta_value );

	return true;
}

/**
 * Get users for the site.
 *
 * For setups that use the multisite feature. Can be used outside of the
 * multisite feature.
 *
 * @since 2.2.0
 * @deprecated 3.1.0 Use get_users()
 * @see get_users()
 *
 * @global wpdb $wpdb    WordPress database abstraction object.
 *
 * @param int $id Site ID.
 * @return array List of users that are part of that site ID
 */
function get_users_of_blog( $id = '' ) {
	_deprecated_function( __FUNCTION__, '3.1.0', 'get_users()' );

	global $wpdb;
	if ( empty( $id ) ) {
		$id = get_current_blog_id();
	}
	$blog_prefix = $wpdb->get_blog_prefix($id);
	$users = $wpdb->get_results( "SELECT user_id, user_id AS ID, user_login, display_name, user_email, meta_value FROM $wpdb->users, $wpdb->usermeta WHERE {$wpdb->users}.ID = {$wpdb->usermeta}.user_id AND meta_key = '{$blog_prefix}capabilities' ORDER BY {$wpdb->usermeta}.user_id" );
	return $users;
}

/**
 * Enable/disable automatic general feed link outputting.
 *
 * @since 2.8.0
 * @deprecated 3.0.0 Use add_theme_support()
 * @see add_theme_support()
 *
 * @param bool $add Optional, default is true. Add or remove links. Defaults to true.
 */
function automatic_feed_links( $add = true ) {
	_deprecated_function( __FUNCTION__, '3.0.0', "add_theme_support( 'automatic-feed-links' )" );

	if ( $add )
		add_theme_support( 'automatic-feed-links' );
	else
		remove_action( 'wp_head', 'feed_links_extra', 3 ); // Just do this yourself in 3.0+
}

/**
 * Retrieve user data based on field.
 *
 * @since 1.5.0
 * @deprecated 3.0.0 Use get_the_author_meta()
 * @see get_the_author_meta()
 *
 * @param string    $field User meta field.
 * @param false|int $user Optional. User ID to retrieve the field for. Default false (current user).
 * @return string The author's field from the current author's DB object.
 */
function get_profile( $field, $user = false ) {
	_deprecated_function( __FUNCTION__, '3.0.0', 'get_the_author_meta()' );
	if ( $user ) {
		$user = get_user_by( 'login', $user );
		$user = $user->ID;
	}
	return get_the_author_meta( $field, $user );
}

/**
 * Retrieves the number of posts a user has written.
 *
 * @since 0.71
 * @deprecated 3.0.0 Use count_user_posts()
 * @see count_user_posts()
 *
 * @param int $userid User to count posts for.
 * @return int Number of posts the given user has written.
 */
function get_usernumposts( $userid ) {
	_deprecated_function( __FUNCTION__, '3.0.0', 'count_user_posts()' );
	return count_user_posts( $userid );
}

/**
 * Callback used to change %uXXXX to &#YYY; syntax
 *
 * @since 2.8.0
 * @access private
 * @deprecated 3.0.0
 *
 * @param array $matches Single Match
 * @return string An HTML entity
 */
function funky_javascript_callback($matches) {
	return "&#".base_convert($matches[1],16,10).";";
}

/**
 * Fixes JavaScript bugs in browsers.
 *
 * Converts unicode characters to HTML numbered entities.
 *
 * @since 1.5.0
 * @deprecated 3.0.0
 *
 * @global $is_macIE
 * @global $is_winIE
 *
 * @param string $text Text to be made safe.
 * @return string Fixed text.
 */
function funky_javascript_fix($text) {
	_deprecated_function( __FUNCTION__, '3.0.0' );
	// Fixes for browsers' JavaScript bugs.
	global $is_macIE, $is_winIE;

	if ( $is_winIE || $is_macIE )
		$text =  preg_replace_callback("/\%u([0-9A-F]{4,4})/",
					"funky_javascript_callback",
					$text);

	return $text;
}

/**
 * Checks that the taxonomy name exists.
 *
 * @since 2.3.0
 * @deprecated 3.0.0 Use taxonomy_exists()
 * @see taxonomy_exists()
 *
 * @param string $taxonomy Name of taxonomy object
 * @return bool Whether the taxonomy exists.
 */
function is_taxonomy( $taxonomy ) {
	_deprecated_function( __FUNCTION__, '3.0.0', 'taxonomy_exists()' );
	return taxonomy_exists( $taxonomy );
}

/**
 * Check if Term exists.
 *
 * @since 2.3.0
 * @deprecated 3.0.0 Use term_exists()
 * @see term_exists()
 *
 * @param int|string $term The term to check
 * @param string $taxonomy The taxonomy name to use
 * @param int $parent ID of parent term under which to confine the exists search.
 * @return mixed Get the term id or Term Object, if exists.
 */
function is_term( $term, $taxonomy = '', $parent = 0 ) {
	_deprecated_function( __FUNCTION__, '3.0.0', 'term_exists()' );
	return term_exists( $term, $taxonomy, $parent );
}

/**
 * Is the current admin page generated by a plugin?
 *
 * Use global $plugin_page and/or get_plugin_page_hookname() hooks.
 *
 * @since 1.5.0
 * @deprecated 3.1.0
 *
 * @global $plugin_page
 *
 * @return bool
 */
function is_plugin_page() {
	_deprecated_function( __FUNCTION__, '3.1.0'  );

	global $plugin_page;

	if ( isset($plugin_page) )
		return true;

	return false;
}

/**
 * Update the categories cache.
 *
 * This function does not appear to be used anymore or does not appear to be
 * needed. It might be a legacy function left over from when there was a need
 * for updating the category cache.
 *
 * @since 1.5.0
 * @deprecated 3.1.0
 *
 * @return bool Always return True
 */
function update_category_cache() {
	_deprecated_function( __FUNCTION__, '3.1.0'  );

	return true;
}

/**
 * Check for PHP timezone support
 *
 * @since 2.9.0
 * @deprecated 3.2.0
 *
 * @return bool
 */
function wp_timezone_supported() {
	_deprecated_function( __FUNCTION__, '3.2.0' );

	return true;
}

/**
 * Displays an editor: TinyMCE, HTML, or both.
 *
 * @since 2.1.0
 * @deprecated 3.3.0 Use wp_editor()
 * @see wp_editor()
 *
 * @param string $content       Textarea content.
 * @param string $id            Optional. HTML ID attribute value. Default 'content'.
 * @param string $prev_id       Optional. Unused.
 * @param bool   $media_buttons Optional. Whether to display media buttons. Default true.
 * @param int    $tab_index     Optional. Unused.
 * @param bool   $extended      Optional. Unused.
 */
function the_editor($content, $id = 'content', $prev_id = 'title', $media_buttons = true, $tab_index = 2, $extended = true) {
	_deprecated_function( __FUNCTION__, '3.3.0', 'wp_editor()' );

	wp_editor( $content, $id, array( 'media_buttons' => $media_buttons ) );
}

/**
 * Perform the query to get the $metavalues array(s) needed by _fill_user and _fill_many_users
 *
 * @since 3.0.0
 * @deprecated 3.3.0
 *
 * @param array $ids User ID numbers list.
 * @return array of arrays. The array is indexed by user_id, containing $metavalues object arrays.
 */
function get_user_metavalues($ids) {
	_deprecated_function( __FUNCTION__, '3.3.0' );

	$objects = array();

	$ids = array_map('intval', $ids);
	foreach ( $ids as $id )
		$objects[$id] = array();

	$metas = update_meta_cache('user', $ids);

	foreach ( $metas as $id => $meta ) {
		foreach ( $meta as $key => $metavalues ) {
			foreach ( $metavalues as $value ) {
				$objects[$id][] = (object)array( 'user_id' => $id, 'meta_key' => $key, 'meta_value' => $value);
			}
		}
	}

	return $objects;
}

/**
 * Sanitize every user field.
 *
 * If the context is 'raw', then the user object or array will get minimal santization of the int fields.
 *
 * @since 2.3.0
 * @deprecated 3.3.0
 *
 * @param object|array $user The User Object or Array
 * @param string $context Optional, default is 'display'. How to sanitize user fields.
 * @return object|array The now sanitized User Object or Array (will be the same type as $user)
 */
function sanitize_user_object($user, $context = 'display') {
	_deprecated_function( __FUNCTION__, '3.3.0' );

	if ( is_object($user) ) {
		if ( !isset($user->ID) )
			$user->ID = 0;
		if ( ! ( $user instanceof WP_User ) ) {
			$vars = get_object_vars($user);
			foreach ( array_keys($vars) as $field ) {
				if ( is_string($user->$field) || is_numeric($user->$field) )
					$user->$field = sanitize_user_field($field, $user->$field, $user->ID, $context);
			}
		}
		$user->filter = $context;
	} else {
		if ( !isset($user['ID']) )
			$user['ID'] = 0;
		foreach ( array_keys($user) as $field )
			$user[$field] = sanitize_user_field($field, $user[$field], $user['ID'], $context);
		$user['filter'] = $context;
	}

	return $user;
}

/**
 * Get boundary post relational link.
 *
 * Can either be start or end post relational link.
 *
 * @since 2.8.0
 * @deprecated 3.3.0
 *
 * @param string $title Optional. Link title format.
 * @param bool $in_same_cat Optional. Whether link should be in a same category.
 * @param string $excluded_categories Optional. Excluded categories IDs.
 * @param bool $start Optional, default is true. Whether to display link to first or last post.
 * @return string
 */
function get_boundary_post_rel_link($title = '%title', $in_same_cat = false, $excluded_categories = '', $start = true) {
	_deprecated_function( __FUNCTION__, '3.3.0' );

	$posts = get_boundary_post($in_same_cat, $excluded_categories, $start);
	// If there is no post stop.
	if ( empty($posts) )
		return;

	// Even though we limited get_posts to return only 1 item it still returns an array of objects.
	$post = $posts[0];

	if ( empty($post->post_title) )
		$post->post_title = $start ? __('First Post') : __('Last Post');

	$date = mysql2date(get_option('date_format'), $post->post_date);

	$title = str_replace('%title', $post->post_title, $title);
	$title = str_replace('%date', $date, $title);
	$title = apply_filters('the_title', $title, $post->ID);

	$link = $start ? "<link rel='start' title='" : "<link rel='end' title='";
	$link .= esc_attr($title);
	$link .= "' href='" . get_permalink($post) . "' />\n";

	$boundary = $start ? 'start' : 'end';
	return apply_filters( "{$boundary}_post_rel_link", $link );
}

/**
 * Display relational link for the first post.
 *
 * @since 2.8.0
 * @deprecated 3.3.0
 *
 * @param string $title Optional. Link title format.
 * @param bool $in_same_cat Optional. Whether link should be in a same category.
 * @param string $excluded_categories Optional. Excluded categories IDs.
 */
function start_post_rel_link($title = '%title', $in_same_cat = false, $excluded_categories = '') {
	_deprecated_function( __FUNCTION__, '3.3.0' );

	echo get_boundary_post_rel_link($title, $in_same_cat, $excluded_categories, true);
}

/**
 * Get site index relational link.
 *
 * @since 2.8.0
 * @deprecated 3.3.0
 *
 * @return string
 */
function get_index_rel_link() {
	_deprecated_function( __FUNCTION__, '3.3.0' );

	$link = "<link rel='index' title='" . esc_attr( get_bloginfo( 'name', 'display' ) ) . "' href='" . esc_url( user_trailingslashit( get_bloginfo( 'url', 'display' ) ) ) . "' />\n";
	return apply_filters( "index_rel_link", $link );
}

/**
 * Display relational link for the site index.
 *
 * @since 2.8.0
 * @deprecated 3.3.0
 */
function index_rel_link() {
	_deprecated_function( __FUNCTION__, '3.3.0' );

	echo get_index_rel_link();
}

/**
 * Get parent post relational link.
 *
 * @since 2.8.0
 * @deprecated 3.3.0
 *
 * @param string $title Optional. Link title format. Default '%title'.
 * @return string
 */
function get_parent_post_rel_link( $title = '%title' ) {
	_deprecated_function( __FUNCTION__, '3.3.0' );

	if ( ! empty( $GLOBALS['post'] ) && ! empty( $GLOBALS['post']->post_parent ) )
		$post = get_post($GLOBALS['post']->post_parent);

	if ( empty($post) )
		return;

	$date = mysql2date(get_option('date_format'), $post->post_date);

	$title = str_replace('%title', $post->post_title, $title);
	$title = str_replace('%date', $date, $title);
	$title = apply_filters('the_title', $title, $post->ID);

	$link = "<link rel='up' title='";
	$link .= esc_attr( $title );
	$link .= "' href='" . get_permalink($post) . "' />\n";

	return apply_filters( "parent_post_rel_link", $link );
}

/**
 * Display relational link for parent item
 *
 * @since 2.8.0
 * @deprecated 3.3.0
 *
 * @param string $title Optional. Link title format. Default '%title'.
 */
function parent_post_rel_link( $title = '%title' ) {
	_deprecated_function( __FUNCTION__, '3.3.0' );

	echo get_parent_post_rel_link($title);
}

/**
 * Add the "Dashboard"/"Visit Site" menu.
 *
 * @since 3.2.0
 * @deprecated 3.3.0
 *
 * @param WP_Admin_Bar $wp_admin_bar WP_Admin_Bar instance.
 */
function wp_admin_bar_dashboard_view_site_menu( $wp_admin_bar ) {
	_deprecated_function( __FUNCTION__, '3.3.0' );

	$user_id = get_current_user_id();

	if ( 0 != $user_id ) {
		if ( is_admin() )
			$wp_admin_bar->add_menu( array( 'id' => 'view-site', 'title' => __( 'Visit Site' ), 'href' => home_url() ) );
		elseif ( is_multisite() )
			$wp_admin_bar->add_menu( array( 'id' => 'dashboard', 'title' => __( 'Dashboard' ), 'href' => get_dashboard_url( $user_id ) ) );
		else
			$wp_admin_bar->add_menu( array( 'id' => 'dashboard', 'title' => __( 'Dashboard' ), 'href' => admin_url() ) );
	}
}

/**
 * Checks if the current user belong to a given site.
 *
 * @since MU (3.0.0)
 * @deprecated 3.3.0 Use is_user_member_of_blog()
 * @see is_user_member_of_blog()
 *
 * @param int $blog_id Site ID
 * @return bool True if the current users belong to $blog_id, false if not.
 */
function is_blog_user( $blog_id = 0 ) {
	_deprecated_function( __FUNCTION__, '3.3.0', 'is_user_member_of_blog()' );

	return is_user_member_of_blog( get_current_user_id(), $blog_id );
}

/**
 * Open the file handle for debugging.
 *
 * @since 0.71
 * @deprecated 3.4.0 Use error_log()
 * @see error_log()
 *
 * @link https://secure.php.net/manual/en/function.error-log.php
 *
 * @param string $filename File name.
 * @param string $mode     Type of access you required to the stream.
 * @return false Always false.
 */
function debug_fopen( $filename, $mode ) {
	_deprecated_function( __FUNCTION__, '3.4.0', 'error_log()' );
	return false;
}

/**
 * Write contents to the file used for debugging.
 *
 * @since 0.71
 * @deprecated 3.4.0 Use error_log()
 * @see error_log()
 *
 * @link https://secure.php.net/manual/en/function.error-log.php
 *
 * @param mixed  $fp     Unused.
 * @param string $string Message to log.
 */
function debug_fwrite( $fp, $string ) {
	_deprecated_function( __FUNCTION__, '3.4.0', 'error_log()' );
	if ( ! empty( $GLOBALS['debug'] ) )
		error_log( $string );
}

/**
 * Close the debugging file handle.
 *
 * @since 0.71
 * @deprecated 3.4.0 Use error_log()
 * @see error_log()
 *
 * @link https://secure.php.net/manual/en/function.error-log.php
 *
 * @param mixed $fp Unused.
 */
function debug_fclose( $fp ) {
	_deprecated_function( __FUNCTION__, '3.4.0', 'error_log()' );
}

/**
 * Retrieve list of themes with theme data in theme directory.
 *
 * The theme is broken, if it doesn't have a parent theme and is missing either
 * style.css and, or index.php. If the theme has a parent theme then it is
 * broken, if it is missing style.css; index.php is optional.
 *
 * @since 1.5.0
 * @deprecated 3.4.0 Use wp_get_themes()
 * @see wp_get_themes()
 *
 * @return array Theme list with theme data.
 */
function get_themes() {
	_deprecated_function( __FUNCTION__, '3.4.0', 'wp_get_themes()' );

	global $wp_themes;
	if ( isset( $wp_themes ) )
		return $wp_themes;

	$themes = wp_get_themes();
	$wp_themes = array();

	foreach ( $themes as $theme ) {
		$name = $theme->get('Name');
		if ( isset( $wp_themes[ $name ] ) )
			$wp_themes[ $name . '/' . $theme->get_stylesheet() ] = $theme;
		else
			$wp_themes[ $name ] = $theme;
	}

	return $wp_themes;
}

/**
 * Retrieve theme data.
 *
 * @since 1.5.0
 * @deprecated 3.4.0 Use wp_get_theme()
 * @see wp_get_theme()
 *
 * @param string $theme Theme name.
 * @return array|null Null, if theme name does not exist. Theme data, if exists.
 */
function get_theme( $theme ) {
	_deprecated_function( __FUNCTION__, '3.4.0', 'wp_get_theme( $stylesheet )' );

	$themes = get_themes();
	if ( is_array( $themes ) && array_key_exists( $theme, $themes ) )
		return $themes[ $theme ];
	return null;
}

/**
 * Retrieve current theme name.
 *
 * @since 1.5.0
 * @deprecated 3.4.0 Use wp_get_theme()
 * @see wp_get_theme()
 *
 * @return string
 */
function get_current_theme() {
	_deprecated_function( __FUNCTION__, '3.4.0', 'wp_get_theme()' );

	if ( $theme = get_option( 'current_theme' ) )
		return $theme;

	return wp_get_theme()->get('Name');
}

/**
 * Accepts matches array from preg_replace_callback in wpautop() or a string.
 *
 * Ensures that the contents of a `<pre>...</pre>` HTML block are not
 * converted into paragraphs or line-breaks.
 *
 * @since 1.2.0
 * @deprecated 3.4.0
 *
 * @param array|string $matches The array or string
 * @return string The pre block without paragraph/line-break conversion.
 */
function clean_pre($matches) {
	_deprecated_function( __FUNCTION__, '3.4.0' );

	if ( is_array($matches) )
		$text = $matches[1] . $matches[2] . "</pre>";
	else
		$text = $matches;

	$text = str_replace(array('<br />', '<br/>', '<br>'), array('', '', ''), $text);
	$text = str_replace('<p>', "\n", $text);
	$text = str_replace('</p>', '', $text);

	return $text;
}


/**
 * Add callbacks for image header display.
 *
 * @since 2.1.0
 * @deprecated 3.4.0 Use add_theme_support()
 * @see add_theme_support()
 *
 * @param callable $wp_head_callback Call on the {@see 'wp_head'} action.
 * @param callable $admin_head_callback Call on custom header administration screen.
 * @param callable $admin_preview_callback Output a custom header image div on the custom header administration screen. Optional.
 */
function add_custom_image_header( $wp_head_callback, $admin_head_callback, $admin_preview_callback = '' ) {
	_deprecated_function( __FUNCTION__, '3.4.0', 'add_theme_support( \'custom-header\', $args )' );
	$args = array(
		'wp-head-callback'    => $wp_head_callback,
		'admin-head-callback' => $admin_head_callback,
	);
	if ( $admin_preview_callback )
		$args['admin-preview-callback'] = $admin_preview_callback;
	return add_theme_support( 'custom-header', $args );
}

/**
 * Remove image header support.
 *
 * @since 3.1.0
 * @deprecated 3.4.0 Use remove_theme_support()
 * @see remove_theme_support()
 *
 * @return null|bool Whether support was removed.
 */
function remove_custom_image_header() {
	_deprecated_function( __FUNCTION__, '3.4.0', 'remove_theme_support( \'custom-header\' )' );
	return remove_theme_support( 'custom-header' );
}

/**
 * Add callbacks for background image display.
 *
 * @since 3.0.0
 * @deprecated 3.4.0 Use add_theme_support()
 * @see add_theme_support()
 *
 * @param callable $wp_head_callback Call on the {@see 'wp_head'} action.
 * @param callable $admin_head_callback Call on custom background administration screen.
 * @param callable $admin_preview_callback Output a custom background image div on the custom background administration screen. Optional.
 */
function add_custom_background( $wp_head_callback = '', $admin_head_callback = '', $admin_preview_callback = '' ) {
	_deprecated_function( __FUNCTION__, '3.4.0', 'add_theme_support( \'custom-background\', $args )' );
	$args = array();
	if ( $wp_head_callback )
		$args['wp-head-callback'] = $wp_head_callback;
	if ( $admin_head_callback )
		$args['admin-head-callback'] = $admin_head_callback;
	if ( $admin_preview_callback )
		$args['admin-preview-callback'] = $admin_preview_callback;
	return add_theme_support( 'custom-background', $args );
}

/**
 * Remove custom background support.
 *
 * @since 3.1.0
 * @deprecated 3.4.0 Use add_custom_background()
 * @see add_custom_background()
 *
 * @return null|bool Whether support was removed.
 */
function remove_custom_background() {
	_deprecated_function( __FUNCTION__, '3.4.0', 'remove_theme_support( \'custom-background\' )' );
	return remove_theme_support( 'custom-background' );
}

/**
 * Retrieve theme data from parsed theme file.
 *
 * @since 1.5.0
 * @deprecated 3.4.0 Use wp_get_theme()
 * @see wp_get_theme()
 *
 * @param string $theme_file Theme file path.
 * @return array Theme data.
 */
function get_theme_data( $theme_file ) {
	_deprecated_function( __FUNCTION__, '3.4.0', 'wp_get_theme()' );
	$theme = new WP_Theme( basename( dirname( $theme_file ) ), dirname( dirname( $theme_file ) ) );

	$theme_data = array(
		'Name' => $theme->get('Name'),
		'URI' => $theme->display('ThemeURI', true, false),
		'Description' => $theme->display('Description', true, false),
		'Author' => $theme->display('Author', true, false),
		'AuthorURI' => $theme->display('AuthorURI', true, false),
		'Version' => $theme->get('Version'),
		'Template' => $theme->get('Template'),
		'Status' => $theme->get('Status'),
		'Tags' => $theme->get('Tags'),
		'Title' => $theme->get('Name'),
		'AuthorName' => $theme->get('Author'),
	);

	foreach ( apply_filters( 'extra_theme_headers', array() ) as $extra_header ) {
		if ( ! isset( $theme_data[ $extra_header ] ) )
			$theme_data[ $extra_header ] = $theme->get( $extra_header );
	}

	return $theme_data;
}

/**
 * Alias of update_post_cache().
 *
 * @see update_post_cache() Posts and pages are the same, alias is intentional
 *
 * @since 1.5.1
 * @deprecated 3.4.0 Use update_post_cache()
 * @see update_post_cache()
 *
 * @param array $pages list of page objects
 */
function update_page_cache( &$pages ) {
	_deprecated_function( __FUNCTION__, '3.4.0', 'update_post_cache()' );

	update_post_cache( $pages );
}

/**
 * Will clean the page in the cache.
 *
 * Clean (read: delete) page from cache that matches $id. Will also clean cache
 * associated with 'all_page_ids' and 'get_pages'.
 *
 * @since 2.0.0
 * @deprecated 3.4.0 Use clean_post_cache
 * @see clean_post_cache()
 *
 * @param int $id Page ID to clean
 */
function clean_page_cache( $id ) {
	_deprecated_function( __FUNCTION__, '3.4.0', 'clean_post_cache()' );

	clean_post_cache( $id );
}

/**
 * Retrieve nonce action "Are you sure" message.
 *
 * Deprecated in 3.4.1 and 3.5.0. Backported to 3.3.3.
 *
 * @since 2.0.4
 * @deprecated 3.4.1 Use wp_nonce_ays()
 * @see wp_nonce_ays()
 *
 * @param string $action Nonce action.
 * @return string Are you sure message.
 */
function wp_explain_nonce( $action ) {
	_deprecated_function( __FUNCTION__, '3.4.1', 'wp_nonce_ays()' );
	return __( 'Are you sure you want to do this?' );
}

/**
 * Display "sticky" CSS class, if a post is sticky.
 *
 * @since 2.7.0
 * @deprecated 3.5.0 Use post_class()
 * @see post_class()
 *
 * @param int $post_id An optional post ID.
 */
function sticky_class( $post_id = null ) {
	_deprecated_function( __FUNCTION__, '3.5.0', 'post_class()' );
	if ( is_sticky( $post_id ) )
		echo ' sticky';
}

/**
 * Retrieve post ancestors.
 *
 * This is no longer needed as WP_Post lazy-loads the ancestors
 * property with get_post_ancestors().
 *
 * @since 2.3.4
 * @deprecated 3.5.0 Use get_post_ancestors()
 * @see get_post_ancestors()
 *
 * @param WP_Post $post Post object, passed by reference (unused).
 */
function _get_post_ancestors( &$post ) {
	_deprecated_function( __FUNCTION__, '3.5.0' );
}

/**
 * Load an image from a string, if PHP supports it.
 *
 * @since 2.1.0
 * @deprecated 3.5.0 Use wp_get_image_editor()
 * @see wp_get_image_editor()
 *
 * @param string $file Filename of the image to load.
 * @return resource The resulting image resource on success, Error string on failure.
 */
function wp_load_image( $file ) {
	_deprecated_function( __FUNCTION__, '3.5.0', 'wp_get_image_editor()' );

	if ( is_numeric( $file ) )
		$file = get_attached_file( $file );

	if ( ! is_file( $file ) ) {
		/* translators: %s: file name */
		return sprintf( __( 'File &#8220;%s&#8221; doesn&#8217;t exist?' ), $file );
	}

	if ( ! function_exists('imagecreatefromstring') )
		return __('The GD image library is not installed.');

	// Set artificially high because GD uses uncompressed images in memory.
	wp_raise_memory_limit( 'image' );

	$image = imagecreatefromstring( file_get_contents( $file ) );

	if ( ! is_resource( $image ) ) {
		/* translators: %s: file name */
		return sprintf( __( 'File &#8220;%s&#8221; is not an image.' ), $file );
	}

	return $image;
}

/**
 * Scale down an image to fit a particular size and save a new copy of the image.
 *
 * The PNG transparency will be preserved using the function, as well as the
 * image type. If the file going in is PNG, then the resized image is going to
 * be PNG. The only supported image types are PNG, GIF, and JPEG.
 *
 * Some functionality requires API to exist, so some PHP version may lose out
 * support. This is not the fault of WordPress (where functionality is
 * downgraded, not actual defects), but of your PHP version.
 *
 * @since 2.5.0
 * @deprecated 3.5.0 Use wp_get_image_editor()
 * @see wp_get_image_editor()
 *
 * @param string $file Image file path.
 * @param int $max_w Maximum width to resize to.
 * @param int $max_h Maximum height to resize to.
 * @param bool $crop Optional. Whether to crop image or resize.
 * @param string $suffix Optional. File suffix.
 * @param string $dest_path Optional. New image file path.
 * @param int $jpeg_quality Optional, default is 90. Image quality percentage.
 * @return mixed WP_Error on failure. String with new destination path.
 */
function image_resize( $file, $max_w, $max_h, $crop = false, $suffix = null, $dest_path = null, $jpeg_quality = 90 ) {
	_deprecated_function( __FUNCTION__, '3.5.0', 'wp_get_image_editor()' );

	$editor = wp_get_image_editor( $file );
	if ( is_wp_error( $editor ) )
		return $editor;
	$editor->set_quality( $jpeg_quality );

	$resized = $editor->resize( $max_w, $max_h, $crop );
	if ( is_wp_error( $resized ) )
		return $resized;

	$dest_file = $editor->generate_filename( $suffix, $dest_path );
	$saved = $editor->save( $dest_file );

	if ( is_wp_error( $saved ) )
		return $saved;

	return $dest_file;
}

/**
 * Retrieve a single post, based on post ID.
 *
 * Has categories in 'post_category' property or key. Has tags in 'tags_input'
 * property or key.
 *
 * @since 1.0.0
 * @deprecated 3.5.0 Use get_post()
 * @see get_post()
 *
 * @param int $postid Post ID.
 * @param string $mode How to return result, either OBJECT, ARRAY_N, or ARRAY_A.
 * @return WP_Post|null Post object or array holding post contents and information
 */
function wp_get_single_post( $postid = 0, $mode = OBJECT ) {
	_deprecated_function( __FUNCTION__, '3.5.0', 'get_post()' );
	return get_post( $postid, $mode );
}

/**
 * Check that the user login name and password is correct.
 *
 * @since 0.71
 * @deprecated 3.5.0 Use wp_authenticate()
 * @see wp_authenticate()
 *
 * @param string $user_login User name.
 * @param string $user_pass User password.
 * @return bool False if does not authenticate, true if username and password authenticates.
 */
function user_pass_ok($user_login, $user_pass) {
	_deprecated_function( __FUNCTION__, '3.5.0', 'wp_authenticate()' );
	$user = wp_authenticate( $user_login, $user_pass );
	if ( is_wp_error( $user ) )
		return false;

	return true;
}

/**
 * Callback formerly fired on the save_post hook. No longer needed.
 *
 * @since 2.3.0
 * @deprecated 3.5.0
 */
function _save_post_hook() {}

/**
 * Check if the installed version of GD supports particular image type
 *
 * @since 2.9.0
 * @deprecated 3.5.0 Use wp_image_editor_supports()
 * @see wp_image_editor_supports()
 *
 * @param string $mime_type
 * @return bool
 */
function gd_edit_image_support($mime_type) {
	_deprecated_function( __FUNCTION__, '3.5.0', 'wp_image_editor_supports()' );

	if ( function_exists('imagetypes') ) {
		switch( $mime_type ) {
			case 'image/jpeg':
				return (imagetypes() & IMG_JPG) != 0;
			case 'image/png':
				return (imagetypes() & IMG_PNG) != 0;
			case 'image/gif':
				return (imagetypes() & IMG_GIF) != 0;
		}
	} else {
		switch( $mime_type ) {
			case 'image/jpeg':
				return function_exists('imagecreatefromjpeg');
			case 'image/png':
				return function_exists('imagecreatefrompng');
			case 'image/gif':
				return function_exists('imagecreatefromgif');
		}
	}
	return false;
}

/**
 * Converts an integer byte value to a shorthand byte value.
 *
 * @since 2.3.0
 * @deprecated 3.6.0 Use size_format()
 * @see size_format()
 *
 * @param int $bytes An integer byte value.
 * @return string A shorthand byte value.
 */
function wp_convert_bytes_to_hr( $bytes ) {
	_deprecated_function( __FUNCTION__, '3.6.0', 'size_format()' );

	$units = array( 0 => 'B', 1 => 'KB', 2 => 'MB', 3 => 'GB', 4 => 'TB' );
	$log   = log( $bytes, KB_IN_BYTES );
	$power = (int) $log;
	$size  = pow( KB_IN_BYTES, $log - $power );

	if ( ! is_nan( $size ) && array_key_exists( $power, $units ) ) {
		$unit = $units[ $power ];
	} else {
		$size = $bytes;
		$unit = $units[0];
	}

	return $size . $unit;
}

/**
 * Formerly used internally to tidy up the search terms.
 *
 * @since 2.9.0
 * @access private
 * @deprecated 3.7.0
 *
 * @param string $t Search terms to "tidy", e.g. trim.
 * @return string Trimmed search terms.
 */
function _search_terms_tidy( $t ) {
	_deprecated_function( __FUNCTION__, '3.7.0' );
	return trim( $t, "\"'\n\r " );
}

/**
 * Determine if TinyMCE is available.
 *
 * Checks to see if the user has deleted the tinymce files to slim down
 * their WordPress installation.
 *
 * @since 2.1.0
 * @deprecated 3.9.0
 *
 * @return bool Whether TinyMCE exists.
 */
function rich_edit_exists() {
	global $wp_rich_edit_exists;
	_deprecated_function( __FUNCTION__, '3.9.0' );

	if ( ! isset( $wp_rich_edit_exists ) )
		$wp_rich_edit_exists = file_exists( ABSPATH . WPINC . '/js/tinymce/tinymce.js' );

	return $wp_rich_edit_exists;
}

/**
 * Old callback for tag link tooltips.
 *
 * @since 2.7.0
 * @access private
 * @deprecated 3.9.0
 *
 * @param int $count Number of topics.
 * @return int Number of topics.
 */
function default_topic_count_text( $count ) {
	return $count;
}

/**
 * Formerly used to escape strings before inserting into the DB.
 *
 * Has not performed this function for many, many years. Use wpdb::prepare() instead.
 *
 * @since 0.71
 * @deprecated 3.9.0
 *
 * @param string $content The text to format.
 * @return string The very same text.
 */
function format_to_post( $content ) {
	_deprecated_function( __FUNCTION__, '3.9.0' );
	return $content;
}

/**
 * Formerly used to escape strings before searching the DB. It was poorly documented and never worked as described.
 *
 * @since 2.5.0
 * @deprecated 4.0.0 Use wpdb::esc_like()
 * @see wpdb::esc_like()
 *
 * @param string $text The text to be escaped.
 * @return string text, safe for inclusion in LIKE query.
 */
function like_escape($text) {
	_deprecated_function( __FUNCTION__, '4.0.0', 'wpdb::esc_like()' );
	return str_replace( array( "%", "_" ), array( "\\%", "\\_" ), $text );
}

/**
 * Determines if the URL can be accessed over SSL.
 *
 * Determines if the URL can be accessed over SSL by using the WordPress HTTP API to access
 * the URL using https as the scheme.
 *
 * @since 2.5.0
 * @deprecated 4.0.0
 *
 * @param string $url The URL to test.
 * @return bool Whether SSL access is available.
 */
function url_is_accessable_via_ssl( $url ) {
	_deprecated_function( __FUNCTION__, '4.0.0' );

	$response = wp_remote_get( set_url_scheme( $url, 'https' ) );

	if ( !is_wp_error( $response ) ) {
		$status = wp_remote_retrieve_response_code( $response );
		if ( 200 == $status || 401 == $status ) {
			return true;
		}
	}

	return false;
}

/**
 * Start preview theme output buffer.
 *
 * Will only perform task if the user has permissions and template and preview
 * query variables exist.
 *
 * @since 2.6.0
 * @deprecated 4.3.0
 */
function preview_theme() {
	_deprecated_function( __FUNCTION__, '4.3.0' );
}

/**
 * Private function to modify the current template when previewing a theme
 *
 * @since 2.9.0
 * @deprecated 4.3.0
 * @access private
 *
 * @return string
 */
function _preview_theme_template_filter() {
	_deprecated_function( __FUNCTION__, '4.3.0' );
	return '';
}

/**
 * Private function to modify the current stylesheet when previewing a theme
 *
 * @since 2.9.0
 * @deprecated 4.3.0
 * @access private
 *
 * @return string
 */
function _preview_theme_stylesheet_filter() {
	_deprecated_function( __FUNCTION__, '4.3.0' );
	return '';
}

/**
 * Callback function for ob_start() to capture all links in the theme.
 *
 * @since 2.6.0
 * @deprecated 4.3.0
 * @access private
 *
 * @param string $content
 * @return string
 */
function preview_theme_ob_filter( $content ) {
	_deprecated_function( __FUNCTION__, '4.3.0' );
	return $content;
}

/**
 * Manipulates preview theme links in order to control and maintain location.
 *
 * Callback function for preg_replace_callback() to accept and filter matches.
 *
 * @since 2.6.0
 * @deprecated 4.3.0
 * @access private
 *
 * @param array $matches
 * @return string
 */
function preview_theme_ob_filter_callback( $matches ) {
	_deprecated_function( __FUNCTION__, '4.3.0' );
	return '';
}

/**
 * Formats text for the rich text editor.
 *
 * The {@see 'richedit_pre'} filter is applied here. If $text is empty the filter will
 * be applied to an empty string.
 *
 * @since 2.0.0
 * @deprecated 4.3.0 Use format_for_editor()
 * @see format_for_editor()
 *
 * @param string $text The text to be formatted.
 * @return string The formatted text after filter is applied.
 */
function wp_richedit_pre($text) {
	_deprecated_function( __FUNCTION__, '4.3.0', 'format_for_editor()' );

	if ( empty( $text ) ) {
		/**
		 * Filters text returned for the rich text editor.
		 *
		 * This filter is first evaluated, and the value returned, if an empty string
		 * is passed to wp_richedit_pre(). If an empty string is passed, it results
		 * in a break tag and line feed.
		 *
		 * If a non-empty string is passed, the filter is evaluated on the wp_richedit_pre()
		 * return after being formatted.
		 *
		 * @since 2.0.0
		 * @deprecated 4.3.0
		 *
		 * @param string $output Text for the rich text editor.
		 */
		return apply_filters( 'richedit_pre', '' );
	}

	$output = convert_chars($text);
	$output = wpautop($output);
	$output = htmlspecialchars($output, ENT_NOQUOTES, get_option( 'blog_charset' ) );

	/** This filter is documented in wp-includes/deprecated.php */
	return apply_filters( 'richedit_pre', $output );
}

/**
 * Formats text for the HTML editor.
 *
 * Unless $output is empty it will pass through htmlspecialchars before the
 * {@see 'htmledit_pre'} filter is applied.
 *
 * @since 2.5.0
 * @deprecated 4.3.0 Use format_for_editor()
 * @see format_for_editor()
 *
 * @param string $output The text to be formatted.
 * @return string Formatted text after filter applied.
 */
function wp_htmledit_pre($output) {
	_deprecated_function( __FUNCTION__, '4.3.0', 'format_for_editor()' );

	if ( !empty($output) )
		$output = htmlspecialchars($output, ENT_NOQUOTES, get_option( 'blog_charset' ) ); // convert only < > &

	/**
	 * Filters the text before it is formatted for the HTML editor.
	 *
	 * @since 2.5.0
	 * @deprecated 4.3.0
	 *
	 * @param string $output The HTML-formatted text.
	 */
	return apply_filters( 'htmledit_pre', $output );
}

/**
 * Retrieve permalink from post ID.
 *
 * @since 1.0.0
 * @deprecated 4.4.0 Use get_permalink()
 * @see get_permalink()
 *
 * @param int|WP_Post $post_id Optional. Post ID or WP_Post object. Default is global $post.
 * @return string|false
 */
function post_permalink( $post_id = 0 ) {
	_deprecated_function( __FUNCTION__, '4.4.0', 'get_permalink()' );

	return get_permalink( $post_id );
}

/**
 * Perform a HTTP HEAD or GET request.
 *
 * If $file_path is a writable filename, this will do a GET request and write
 * the file to that path.
 *
 * @since 2.5.0
 * @deprecated 4.4.0 Use WP_Http
 * @see WP_Http
 *
 * @param string      $url       URL to fetch.
 * @param string|bool $file_path Optional. File path to write request to. Default false.
 * @param int         $red       Optional. The number of Redirects followed, Upon 5 being hit,
 *                               returns false. Default 1.
 * @return bool|string False on failure and string of headers if HEAD request.
 */
function wp_get_http( $url, $file_path = false, $red = 1 ) {
	_deprecated_function( __FUNCTION__, '4.4.0', 'WP_Http' );

	@set_time_limit( 60 );

	if ( $red > 5 )
		return false;

	$options = array();
	$options['redirection'] = 5;

	if ( false == $file_path )
		$options['method'] = 'HEAD';
	else
		$options['method'] = 'GET';

	$response = wp_safe_remote_request( $url, $options );

	if ( is_wp_error( $response ) )
		return false;

	$headers = wp_remote_retrieve_headers( $response );
	$headers['response'] = wp_remote_retrieve_response_code( $response );

	// WP_HTTP no longer follows redirects for HEAD requests.
	if ( 'HEAD' == $options['method'] && in_array($headers['response'], array(301, 302)) && isset( $headers['location'] ) ) {
		return wp_get_http( $headers['location'], $file_path, ++$red );
	}

	if ( false == $file_path )
		return $headers;

	// GET request - write it to the supplied filename
	$out_fp = fopen($file_path, 'w');
	if ( !$out_fp )
		return $headers;

	fwrite( $out_fp,  wp_remote_retrieve_body( $response ) );
	fclose($out_fp);
	clearstatcache();

	return $headers;
}

/**
 * Whether SSL login should be forced.
 *
 * @since 2.6.0
 * @deprecated 4.4.0 Use force_ssl_admin()
 * @see force_ssl_admin()
 *
 * @param string|bool $force Optional Whether to force SSL login. Default null.
 * @return bool True if forced, false if not forced.
 */
function force_ssl_login( $force = null ) {
	_deprecated_function( __FUNCTION__, '4.4.0', 'force_ssl_admin()' );
	return force_ssl_admin( $force );
}

/**
 * Retrieve path of comment popup template in current or parent template.
 *
 * @since 1.5.0
 * @deprecated 4.5.0
 *
 * @return string Full path to comments popup template file.
 */
function get_comments_popup_template() {
	_deprecated_function( __FUNCTION__, '4.5.0' );

	return '';
}

/**
 * Whether the current URL is within the comments popup window.
 *
 * @since 1.5.0
 * @deprecated 4.5.0
 *
 * @return bool
 */
function is_comments_popup() {
	_deprecated_function( __FUNCTION__, '4.5.0' );

	return false;
}

/**
 * Display the JS popup script to show a comment.
 *
 * @since 0.71
 * @deprecated 4.5.0
 */
function comments_popup_script() {
	_deprecated_function( __FUNCTION__, '4.5.0' );
}

/**
 * Adds element attributes to open links in new windows.
 *
 * @since 0.71
 * @deprecated 4.5.0
 *
 * @param string $text Content to replace links to open in a new window.
 * @return string Content that has filtered links.
 */
function popuplinks( $text ) {
	_deprecated_function( __FUNCTION__, '4.5.0' );
	$text = preg_replace('/<a (.+?)>/i', "<a $1 target='_blank' rel='external'>", $text);
	return $text;
}

/**
 * The Google Video embed handler callback.
 *
 * Deprecated function that previously assisted in turning Google Video URLs
 * into embeds but that service has since been shut down.
 *
 * @since 2.9.0
 * @deprecated 4.6.0
 *
 * @return string An empty string.
 */
function wp_embed_handler_googlevideo( $matches, $attr, $url, $rawattr ) {
	_deprecated_function( __FUNCTION__, '4.6.0' );

	return '';
}

/**
 * Retrieve path of paged template in current or parent template.
 *
 * @since 1.5.0
 * @deprecated 4.7.0 The paged.php template is no longer part of the theme template hierarchy.
 *
 * @return string Full path to paged template file.
 */
function get_paged_template() {
	_deprecated_function( __FUNCTION__, '4.7.0' );

	return get_query_template( 'paged' );
}

/**
 * Removes the HTML JavaScript entities found in early versions of Netscape 4.
 *
 * Previously, this function was pulled in from the original
 * import of kses and removed a specific vulnerability only
 * existent in early version of Netscape 4. However, this
 * vulnerability never affected any other browsers and can
 * be considered safe for the modern web.
 *
 * The regular expression which sanitized this vulnerability
 * has been removed in consideration of the performance and
 * energy demands it placed, now merely passing through its
 * input to the return.
 *
 * @since 1.0.0
 * @deprecated 4.7.0 Officially dropped security support for Netscape 4.
 *
 * @param string $string
 * @return string
 */
function wp_kses_js_entities( $string ) {
	_deprecated_function( __FUNCTION__, '4.7.0' );

	return preg_replace( '%&\s*\{[^}]*(\}\s*;?|$)%', '', $string );
}

/**
 * Sort categories by ID.
 *
 * Used by usort() as a callback, should not be used directly. Can actually be
 * used to sort any term object.
 *
 * @since 2.3.0
 * @deprecated 4.7.0 Use wp_list_sort()
 * @access private
 *
 * @param object $a
 * @param object $b
 * @return int
 */
function _usort_terms_by_ID( $a, $b ) {
	_deprecated_function( __FUNCTION__, '4.7.0', 'wp_list_sort()' );

	if ( $a->term_id > $b->term_id )
		return 1;
	elseif ( $a->term_id < $b->term_id )
		return -1;
	else
		return 0;
}

/**
 * Sort categories by name.
 *
 * Used by usort() as a callback, should not be used directly. Can actually be
 * used to sort any term object.
 *
 * @since 2.3.0
 * @deprecated 4.7.0 Use wp_list_sort()
 * @access private
 *
 * @param object $a
 * @param object $b
 * @return int
 */
function _usort_terms_by_name( $a, $b ) {
	_deprecated_function( __FUNCTION__, '4.7.0', 'wp_list_sort()' );

	return strcmp( $a->name, $b->name );
}

/**
 * Sort menu items by the desired key.
 *
 * @since 3.0.0
 * @deprecated 4.7.0 Use wp_list_sort()
 * @access private
 *
 * @global string $_menu_item_sort_prop
 *
 * @param object $a The first object to compare
 * @param object $b The second object to compare
 * @return int -1, 0, or 1 if $a is considered to be respectively less than, equal to, or greater than $b.
 */
function _sort_nav_menu_items( $a, $b ) {
	global $_menu_item_sort_prop;

	_deprecated_function( __FUNCTION__, '4.7.0', 'wp_list_sort()' );

	if ( empty( $_menu_item_sort_prop ) )
		return 0;

	if ( ! isset( $a->$_menu_item_sort_prop ) || ! isset( $b->$_menu_item_sort_prop ) )
		return 0;

	$_a = (int) $a->$_menu_item_sort_prop;
	$_b = (int) $b->$_menu_item_sort_prop;

	if ( $a->$_menu_item_sort_prop == $b->$_menu_item_sort_prop )
		return 0;
	elseif ( $_a == $a->$_menu_item_sort_prop && $_b == $b->$_menu_item_sort_prop )
		return $_a < $_b ? -1 : 1;
	else
		return strcmp( $a->$_menu_item_sort_prop, $b->$_menu_item_sort_prop );
}

/**
 * Retrieves the Press This bookmarklet link.
 *
 * @since 2.6.0
 * @deprecated 4.9.0
 *
 */
function get_shortcut_link() {
	_deprecated_function( __FUNCTION__, '4.9.0' );

	$link = '';

	/**
	 * Filters the Press This bookmarklet link.
	 *
	 * @since 2.6.0
	 * @deprecated 4.9.0
	 *
	 * @param string $link The Press This bookmarklet link.
	 */
	return apply_filters( 'shortcut_link', $link );
}

/**
* Ajax handler for saving a post from Press This.
*
* @since 4.2.0
* @deprecated 4.9.0
*/
function wp_ajax_press_this_save_post() {
	_deprecated_function( __FUNCTION__, '4.9.0' );
	if ( is_plugin_active( 'press-this/press-this-plugin.php' ) ) {
		include( WP_PLUGIN_DIR . '/press-this/class-wp-press-this-plugin.php' );
		$wp_press_this = new WP_Press_This_Plugin();
		$wp_press_this->save_post();
	} else {
		wp_send_json_error( array( 'errorMessage' => __( 'The Press This plugin is required.' ) ) );
	}
}

/**
* Ajax handler for creating new category from Press This.
*
* @since 4.2.0
* @deprecated 4.9.0
*/
function wp_ajax_press_this_add_category() {
	_deprecated_function( __FUNCTION__, '4.9.0' );
	if ( is_plugin_active( 'press-this/press-this-plugin.php' ) ) {
		include( WP_PLUGIN_DIR . '/press-this/class-wp-press-this-plugin.php' );
		$wp_press_this = new WP_Press_This_Plugin();
		$wp_press_this->add_category();
	} else {
		wp_send_json_error( array( 'errorMessage' => __( 'The Press This plugin is required.' ) ) );
	}
}

/**
 * Filter the SQL clauses of an attachment query to include filenames.
 *
 * @since 4.7.0
 * @deprecated 6.0.3
 * @access private
 *
 * @param array $clauses An array including WHERE, GROUP BY, JOIN, ORDER BY,
 *                       DISTINCT, fields (SELECT), and LIMITS clauses.
 * @return array The unmodified clauses.
 */
function _filter_query_attachment_filenames( $clauses ) {
	_deprecated_function( __FUNCTION__, '6.0.3', 'add_filter( "wp_allow_query_attachment_by_filename", "__return_true" )');
	remove_filter( 'posts_clauses', __FUNCTION__ );
	return $clauses;
}