* @since 2.5.0
		 *
		 * @param bool       $check    Whether the passwords match.
		 * @param string     $password The plaintext password.
		 * @param string     $hash     The hashed password.
		 * @param string|int $user_id  User ID. Can be empty.
		 */
		return apply_filters( 'check_password', $check, $password, $hash, $user_id );
	}

	// If the stored hash is longer than an MD5, presume the
	// new style phpass portable hash.
	if ( empty($wp_hasher) ) {
		require_once( ABSPATH . WPINC . '/class-phpass.php');
		// By default, use the portable hash from phpass
		$wp_hasher = new PasswordHash(8, true);
	}

	$check = $wp_hasher->CheckPassword($password, $hash);

	/** This filter is documented in wp-includes/pluggable.php */
	return apply_filters( 'check_password', $check, $password, $hash, $user_id );
}
endif;

if ( !function_exists('wp_generate_password') ) :
/**
 * Generates a random password drawn from the defined set of characters.
 *
 * @since 2.5.0
 *
 * @param int  $length              Optional. The length of password to generate. Default 12.
 * @param bool $special_chars       Optional. Whether to include standard special characters.
 *                                  Default true.
 * @param bool $extra_special_chars Optional. Whether to include other special characters.
 *                                  Used when generating secret keys and salts. Default false.
 * @return string The random password.
 */
function wp_generate_password( $length = 12, $special_chars = true, $extra_special_chars = false ) {
	$chars = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789';
	if ( $special_chars )
		$chars .= '!@#$%^&*()';
	if ( $extra_special_chars )
		$chars .= '-_ []{}<>~`+=,.;:/?|';

	$password = '';
	for ( $i = 0; $i < $length; $i++ ) {
		$password .= substr($chars, wp_rand(0, strlen($chars) - 1), 1);
	}

	/**
	 * Filters the randomly-generated password.
	 *
	 * @since 3.0.0
	 *
	 * @param string $password The generated password.
	 */
	return apply_filters( 'random_password', $password );
}
endif;

if ( !function_exists('wp_rand') ) :
/**
 * Generates a random number
 *
 * @since 2.6.2
 * @since 4.4.0 Uses PHP7 random_int() or the random_compat library if available.
 *
 * @global string $rnd_value
 * @staticvar string $seed
 * @staticvar bool $external_rand_source_available
 *
 * @param int $min Lower limit for the generated number
 * @param int $max Upper limit for the generated number
 * @return int A random number between min and max
 */
function wp_rand( $min = 0, $max = 0 ) {
	global $rnd_value;

	// Some misconfigured 32bit environments (Entropy PHP, for example) truncate integers larger than PHP_INT_MAX to PHP_INT_MAX rather than overflowing them to floats.
	$max_random_number = 3000000000 === 2147483647 ? (float) "4294967295" : 4294967295; // 4294967295 = 0xffffffff

	// We only handle Ints, floats are truncated to their integer value.
	$min = (int) $min;
	$max = (int) $max;

	// Use PHP's CSPRNG, or a compatible method
	static $use_random_int_functionality = true;
	if ( $use_random_int_functionality ) {
		try {
			$_max = ( 0 != $max ) ? $max : $max_random_number;
			// wp_rand() can accept arguments in either order, PHP cannot.
			$_max = max( $min, $_max );
			$_min = min( $min, $_max );
			$val = random_int( $_min, $_max );
			if ( false !== $val ) {
				return absint( $val );
			} else {
				$use_random_int_functionality = false;
			}
		} catch ( Error $e ) {
			$use_random_int_functionality = false;
		} catch ( Exception $e ) {
			$use_random_int_functionality = false;
		}
	}

	// Reset $rnd_value after 14 uses
	// 32(md5) + 40(sha1) + 40(sha1) / 8 = 14 random numbers from $rnd_value
	if ( strlen($rnd_value) < 8 ) {
		if ( defined( 'WP_SETUP_CONFIG' ) )
			static $seed = '';
		else
			$seed = get_transient('random_seed');
		$rnd_value = md5( uniqid(microtime() . mt_rand(), true ) . $seed );
		$rnd_value .= sha1($rnd_value);
		$rnd_value .= sha1($rnd_value . $seed);
		$seed = md5($seed . $rnd_value);
		if ( ! defined( 'WP_SETUP_CONFIG' ) && ! defined( 'WP_INSTALLING' ) ) {
			set_transient( 'random_seed', $seed );
		}
	}

	// Take the first 8 digits for our value
	$value = substr($rnd_value, 0, 8);

	// Strip the first eight, leaving the remainder for the next call to wp_rand().
	$rnd_value = substr($rnd_value, 8);

	$value = abs(hexdec($value));

	// Reduce the value to be within the min - max range
	if ( $max != 0 )
		$value = $min + ( $max - $min + 1 ) * $value / ( $max_random_number + 1 );

	return abs(intval($value));
}
endif;

if ( !function_exists('wp_set_password') ) :
/**
 * Updates the user's password with a new encrypted one.
 *
 * For integration with other applications, this function can be overwritten to
 * instead use the other package password checking algorithm.
 *
 * Please note: This function should be used sparingly and is really only meant for single-time
 * application. Leveraging this improperly in a plugin or theme could result in an endless loop
 * of password resets if precautions are not taken to ensure it does not execute on every page load.
 *
 * @since 2.5.0
 *
 * @global wpdb $wpdb WordPress database abstraction object.
 *
 * @param string $password The plaintext new user password
 * @param int    $user_id  User ID
 */
function wp_set_password( $password, $user_id ) {
	global $wpdb;

	$hash = wp_hash_password( $password );
	$wpdb->update($wpdb->users, array('user_pass' => $hash, 'user_activation_key' => ''), array('ID' => $user_id) );

	wp_cache_delete($user_id, 'users');
}
endif;

if ( !function_exists( 'get_avatar' ) ) :
/**
 * Retrieve the avatar `<img>` tag for a user, email address, MD5 hash, comment, or post.
 *
 * @since 2.5.0
 * @since 4.2.0 Optional `$args` parameter added.
 *
 * @param mixed $id_or_email The Gravatar to retrieve. Accepts a user_id, gravatar md5 hash,
 *                           user email, WP_User object, WP_Post object, or WP_Comment object.
 * @param int    $size       Optional. Height and width of the avatar image file in pixels. Default 96.
 * @param string $default    Optional. URL for the default image or a default type. Accepts '404'
 *                           (return a 404 instead of a default image), 'retro' (8bit), 'monsterid'
 *                           (monster), 'wavatar' (cartoon face), 'indenticon' (the "quilt"),
 *                           'mystery', 'mm', or 'mysteryman' (The Oyster Man), 'blank' (transparent GIF),
 *                           or 'gravatar_default' (the Gravatar logo). Default is the value of the
 *                           'avatar_default' option, with a fallback of 'mystery'.
 * @param string $alt        Optional. Alternative text to use in &lt;img&gt; tag. Default empty.
 * @param array  $args       {
 *     Optional. Extra arguments to retrieve the avatar.
 *
 *     @type int          $height        Display height of the avatar in pixels. Defaults to $size.
 *     @type int          $width         Display width of the avatar in pixels. Defaults to $size.
 *     @type bool         $force_default Whether to always show the default image, never the Gravatar. Default false.
 *     @type string       $rating        What rating to display avatars up to. Accepts 'G', 'PG', 'R', 'X', and are
 *                                       judged in that order. Default is the value of the 'avatar_rating' option.
 *     @type string       $scheme        URL scheme to use. See set_url_scheme() for accepted values.
 *                                       Default null.
 *     @type array|string $class         Array or string of additional classes to add to the &lt;img&gt; element.
 *                                       Default null.
 *     @type bool         $force_display Whether to always show the avatar - ignores the show_avatars option.
 *                                       Default false.
 *     @type string       $extra_attr    HTML attributes to insert in the IMG element. Is not sanitized. Default empty.
 * }
 * @return false|string `<img>` tag for the user's avatar. False on failure.
 */
function get_avatar( $id_or_email, $size = 96, $default = '', $alt = '', $args = null ) {
	$defaults = array(
		// get_avatar_data() args.
		'size'          => 96,
		'height'        => null,
		'width'         => null,
		'default'       => get_option( 'avatar_default', 'mystery' ),
		'force_default' => false,
		'rating'        => get_option( 'avatar_rating' ),
		'scheme'        => null,
		'alt'           => '',
		'class'         => null,
		'force_display' => false,
		'extra_attr'    => '',
	);

	if ( empty( $args ) ) {
		$args = array();
	}

	$args['size']    = (int) $size;
	$args['default'] = $default;
	$args['alt']     = $alt;

	$args = wp_parse_args( $args, $defaults );

	if ( empty( $args['height'] ) ) {
		$args['height'] = $args['size'];
	}
	if ( empty( $args['width'] ) ) {
		$args['width'] = $args['size'];
	}

	if ( is_object( $id_or_email ) && isset( $id_or_email->comment_ID ) ) {
		$id_or_email = get_comment( $id_or_email );
	}

	/**
	 * Filters whether to retrieve the avatar URL early.
	 *
	 * Passing a non-null value will effectively short-circuit get_avatar(), passing
	 * the value through the {@see 'get_avatar'} filter and returning early.
	 *
	 * @since 4.2.0
	 *
	 * @param string $avatar      HTML for the user's avatar. Default null.
	 * @param mixed  $id_or_email The Gravatar to retrieve. Accepts a user_id, gravatar md5 hash,
	 *                            user email, WP_User object, WP_Post object, or WP_Comment object.
	 * @param array  $args        Arguments passed to get_avatar_url(), after processing.
	 */
	$avatar = apply_filters( 'pre_get_avatar', null, $id_or_email, $args );

	if ( ! is_null( $avatar ) ) {
		/** This filter is documented in wp-includes/pluggable.php */
		return apply_filters( 'get_avatar', $avatar, $id_or_email, $args['size'], $args['default'], $args['alt'], $args );
	}

	if ( ! $args['force_display'] && ! get_option( 'show_avatars' ) ) {
		return false;
	}

	$url2x = get_avatar_url( $id_or_email, array_merge( $args, array( 'size' => $args['size'] * 2 ) ) );

	$args = get_avatar_data( $id_or_email, $args );

	$url = $args['url'];

	if ( ! $url || is_wp_error( $url ) ) {
		return false;
	}

	$class = array( 'avatar', 'avatar-' . (int) $args['size'], 'photo' );

	if ( ! $args['found_avatar'] || $args['force_default'] ) {
		$class[] = 'avatar-default';
	}

	if ( $args['class'] ) {
		if ( is_array( $args['class'] ) ) {
			$class = array_merge( $class, $args['class'] );
		} else {
			$class[] = $args['class'];
		}
	}

	$avatar = sprintf(
		"<img alt='%s' src='%s' srcset='%s' class='%s' height='%d' width='%d' %s/>",
		esc_attr( $args['alt'] ),
		esc_url( $url ),
		esc_url( $url2x ) . ' 2x',
		esc_attr( join( ' ', $class ) ),
		(int) $args['height'],
		(int) $args['width'],
		$args['extra_attr']
	);

	/**
	 * Filters the avatar to retrieve.
	 *
	 * @since 2.5.0
	 * @since 4.2.0 The `$args` parameter was added.
	 *
	 * @param string $avatar      &lt;img&gt; tag for the user's avatar.
	 * @param mixed  $id_or_email The Gravatar to retrieve. Accepts a user_id, gravatar md5 hash,
	 *                            user email, WP_User object, WP_Post object, or WP_Comment object.
	 * @param int    $size        Square avatar width and height in pixels to retrieve.
	 * @param string $default     URL for the default image or a default type. Accepts '404', 'retro', 'monsterid',
	 *                            'wavatar', 'indenticon','mystery' (or 'mm', or 'mysteryman'), 'blank', or 'gravatar_default'.
	 *                            Default is the value of the 'avatar_default' option, with a fallback of 'mystery'.
	 * @param string $alt         Alternative text to use in the avatar image tag. Default empty.
	 * @param array  $args        Arguments passed to get_avatar_data(), after processing.
	 */
	return apply_filters( 'get_avatar', $avatar, $id_or_email, $args['size'], $args['default'], $args['alt'], $args );
}
endif;

if ( !function_exists( 'wp_text_diff' ) ) :
/**
 * Displays a human readable HTML representation of the difference between two strings.
 *
 * The Diff is available for getting the changes between versions. The output is
 * HTML, so the primary use is for displaying the changes. If the two strings
 * are equivalent, then an empty string will be returned.
 *
 * The arguments supported and can be changed are listed below.
 *
 * 'title' : Default is an empty string. Titles the diff in a manner compatible
 *		with the output.
 * 'title_left' : Default is an empty string. Change the HTML to the left of the
 *		title.
 * 'title_right' : Default is an empty string. Change the HTML to the right of
 *		the title.
 *
 * @since 2.6.0
 *
 * @see wp_parse_args() Used to change defaults to user defined settings.
 * @uses Text_Diff
 * @uses WP_Text_Diff_Renderer_Table
 *
 * @param string       $left_string  "old" (left) version of string
 * @param string       $right_string "new" (right) version of string
 * @param string|array $args         Optional. Change 'title', 'title_left', and 'title_right' defaults.
 * @return string Empty string if strings are equivalent or HTML with differences.
 */
function wp_text_diff( $left_string, $right_string, $args = null ) {
	$defaults = array( 'title' => '', 'title_left' => '', 'title_right' => '' );
	$args = wp_parse_args( $args, $defaults );

	if ( ! class_exists( 'WP_Text_Diff_Renderer_Table', false ) )
		require( ABSPATH . WPINC . '/wp-diff.php' );

	$left_string  = normalize_whitespace($left_string);
	$right_string = normalize_whitespace($right_string);

	$left_lines  = explode("\n", $left_string);
	$right_lines = explode("\n", $right_string);
	$text_diff = new Text_Diff($left_lines, $right_lines);
	$renderer  = new WP_Text_Diff_Renderer_Table( $args );
	$diff = $renderer->render($text_diff);

	if ( !$diff )
		return '';

	$r  = "<table class='diff'>\n";

	if ( ! empty( $args[ 'show_split_view' ] ) ) {
		$r .= "<col class='content diffsplit left' /><col class='content diffsplit middle' /><col class='content diffsplit right' />";
	} else {
		$r .= "<col class='content' />";
	}

	if ( $args['title'] || $args['title_left'] || $args['title_right'] )
		$r .= "<thead>";
	if ( $args['title'] )
		$r .= "<tr class='diff-title'><th colspan='4'>$args[title]</th></tr>\n";
	if ( $args['title_left'] || $args['title_right'] ) {
		$r .= "<tr class='diff-sub-title'>\n";
		$r .= "\t<td></td><th>$args[title_left]</th>\n";
		$r .= "\t<td></td><th>$args[title_right]</th>\n";
		$r .= "</tr>\n";
	}
	if ( $args['title'] || $args['title_left'] || $args['title_right'] )
		$r .= "</thead>\n";

	$r .= "<tbody>\n$diff\n</tbody>\n";
	$r .= "</table>";

	return $r;
}
endif;