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<?php

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/**

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* WPSEO plugin file.

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* @package WPSEO\Internals

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* @since 1.8.0

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use Yoast\WP\SEO\Integrations\Feature_Flag_Integration;

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/**

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* Group of utility methods for use by WPSEO.

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* All methods are static, this is just a sort of namespacing class wrapper.

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class WPSEO_Utils {

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/**

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* Whether the PHP filter extension is enabled.

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* @since 1.8.0

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* @var bool

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public static $has_filters;

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/**

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* Check whether file editing is allowed for the .htaccess and robots.txt files.

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* {@internal current_user_can() checks internally whether a user is on wp-ms and adjusts accordingly.}}

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* @since 1.8.0

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* @return bool

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public static function allow_system_file_edit() {

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$allowed = true;

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if ( current_user_can( 'edit_files' ) === false ) {

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$allowed = false;

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}

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/**

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* Filter: 'wpseo_allow_system_file_edit' - Allow developers to change whether the editing of

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* .htaccess and robots.txt is allowed.

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* @param bool $allowed Whether file editing is allowed.

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return apply_filters( 'wpseo_allow_system_file_edit', $allowed );

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}

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/**

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* Check if the web server is running on Apache or compatible (LiteSpeed).

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* @since 1.8.0

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* @return bool

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public static function is_apache() {

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if ( ! isset( $_SERVER['SERVER_SOFTWARE'] ) ) {

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return false;

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}

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$software = sanitize_text_field( wp_unslash( $_SERVER['SERVER_SOFTWARE'] ) );

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return stripos( $software, 'apache' ) !== false || stripos( $software, 'litespeed' ) !== false;

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}

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/**

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* Check if the web server is running on Nginx.

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* @since 1.8.0

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* @return bool

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public static function is_nginx() {

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if ( ! isset( $_SERVER['SERVER_SOFTWARE'] ) ) {

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return false;

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}

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$software = sanitize_text_field( wp_unslash( $_SERVER['SERVER_SOFTWARE'] ) );

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return stripos( $software, 'nginx' ) !== false;

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}

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/**

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* Check whether a url is relative.

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* @since 1.8.0

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* @param string $url URL string to check.

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* @return bool

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public static function is_url_relative( $url ) {

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return YoastSEO()->helpers->url->is_relative( $url );

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}

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/**

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* Recursively trim whitespace round a string value or of string values within an array.

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* Only trims strings to avoid typecasting a variable (to string).

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* @since 1.8.0

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* @param mixed $value Value to trim or array of values to trim.

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* @return mixed Trimmed value or array of trimmed values.

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public static function trim_recursive( $value ) {

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if ( is_string( $value ) ) {

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$value = trim( $value );

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}

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elseif ( is_array( $value ) ) {

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$value = array_map( [ self::class, 'trim_recursive' ], $value );

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}

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return $value;

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}

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/**

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* Emulate the WP native sanitize_text_field function in a %%variable%% safe way.

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* Sanitize a string from user input or from the db.

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* - Check for invalid UTF-8;

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* - Convert single < characters to entity;

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* - Strip all tags;

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* - Remove line breaks, tabs and extra white space;

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* - Strip octets - BUT DO NOT REMOVE (part of) VARIABLES WHICH WILL BE REPLACED.

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* @link https://core.trac.wordpress.org/browser/trunk/src/wp-includes/formatting.php for the original.

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* @since 1.8.0

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* @param string $value String value to sanitize.

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* @return string

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public static function sanitize_text_field( $value ) {

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$filtered = wp_check_invalid_utf8( $value );

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if ( strpos( $filtered, '<' ) !== false ) {

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$filtered = wp_pre_kses_less_than( $filtered );

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// This will strip extra whitespace for us.

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$filtered = wp_strip_all_tags( $filtered, true );

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}

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else {

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$filtered = trim( preg_replace( '`[\r\n\t ]+`', ' ', $filtered ) );

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}

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$found = false;

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while ( preg_match( '`[^%](%[a-f0-9]{2})`i', $filtered, $match ) ) {

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$filtered = str_replace( $match[1], '', $filtered );

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$found = true;

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}

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unset( $match );

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if ( $found ) {

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// Strip out the whitespace that may now exist after removing the octets.

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$filtered = trim( preg_replace( '` +`', ' ', $filtered ) );

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}

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/**

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* Filter a sanitized text field string.

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* @since WP 2.9.0

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* @param string $filtered The sanitized string.

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* @param string $str The string prior to being sanitized.

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return apply_filters( 'sanitize_text_field', $filtered, $value ); // phpcs:ignore WordPress.NamingConventions.PrefixAllGlobals -- Using WP native filter.

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}

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/**

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* Sanitize a url for saving to the database.

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* Not to be confused with the old native WP function.

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* @since 1.8.0

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* @param string $value String URL value to sanitize.

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* @param array $allowed_protocols Optional set of allowed protocols.

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* @return string

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public static function sanitize_url( $value, $allowed_protocols = [ 'http', 'https' ] ) {

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$url = '';

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$parts = wp_parse_url( $value );

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if ( isset( $parts['scheme'], $parts['host'] ) ) {

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$url = $parts['scheme'] . '://';

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if ( isset( $parts['user'] ) ) {

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$url .= rawurlencode( $parts['user'] );

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$url .= isset( $parts['pass'] ) ? ':' . rawurlencode( $parts['pass'] ) : '';

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$url .= '@';

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}

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$parts['host'] = preg_replace(

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'`[^a-z0-9-.:\[\]\\x80-\\xff]`',

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'',

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strtolower( $parts['host'] )

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);

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$url .= $parts['host'] . ( isset( $parts['port'] ) ? ':' . intval( $parts['port'] ) : '' );

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}

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if ( isset( $parts['path'] ) && strpos( $parts['path'], '/' ) === 0 ) {

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$path = explode( '/', wp_strip_all_tags( $parts['path'] ) );

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$path = self::sanitize_encoded_text_field( $path );

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$url .= str_replace( '%40', '@', implode( '/', $path ) );

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}

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if ( ! $url ) {

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return '';

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}

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if ( isset( $parts['query'] ) ) {

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wp_parse_str( $parts['query'], $parsed_query );

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$parsed_query = array_combine(

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self::sanitize_encoded_text_field( array_keys( $parsed_query ) ),

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self::sanitize_encoded_text_field( array_values( $parsed_query ) )

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);

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$url = add_query_arg( $parsed_query, $url );

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}

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if ( isset( $parts['fragment'] ) ) {

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$url .= '#' . self::sanitize_encoded_text_field( $parts['fragment'] );

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}

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if ( strpos( $url, '%' ) !== false ) {

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$url = preg_replace_callback(

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'`%[a-fA-F0-9]{2}`',

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static function ( $octects ) {

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return strtolower( $octects[0] );

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$url

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);

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}

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return esc_url_raw( $url, $allowed_protocols );

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}

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/**

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* Decode, sanitize and encode the array of strings or the string.

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* @since 13.3

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* @param array|string $value The value to sanitize and encode.

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* @return array|string The sanitized value.

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public static function sanitize_encoded_text_field( $value ) {

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if ( is_array( $value ) ) {

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return array_map( [ self::class, 'sanitize_encoded_text_field' ], $value );

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}

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return rawurlencode( sanitize_text_field( rawurldecode( $value ) ) );

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}

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/**

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* Validate a value as boolean.

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* @since 1.8.0

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* @param mixed $value Value to validate.

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* @return bool

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public static function validate_bool( $value ) {

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if ( ! isset( self::$has_filters ) ) {

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self::$has_filters = extension_loaded( 'filter' );

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}

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if ( self::$has_filters ) {

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return filter_var( $value, FILTER_VALIDATE_BOOLEAN );

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}

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else {

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return self::emulate_filter_bool( $value );

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}

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}

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/**

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* Cast a value to bool.

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* @since 1.8.0

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* @param mixed $value Value to cast.

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* @return bool

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public static function emulate_filter_bool( $value ) {

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$true = [

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'1',

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'true',

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'True',

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'TRUE',

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'y',

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'Y',

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'yes',

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'Yes',

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'YES',

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'on',

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'On',

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'ON',

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];

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$false = [

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'0',

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'false',

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'False',

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'FALSE',

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'n',

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'N',

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'no',

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'No',

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'NO',

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'off',

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'Off',

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'OFF',

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];

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if ( is_bool( $value ) ) {

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return $value;

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}

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elseif ( is_int( $value ) && ( $value === 0 || $value === 1 ) ) {

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return (bool) $value;

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}

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elseif ( ( is_float( $value ) && ! is_nan( $value ) ) && ( $value === (float) 0 || $value === (float) 1 ) ) {

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return (bool) $value;

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}

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elseif ( is_string( $value ) ) {

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$value = trim( $value );

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if ( in_array( $value, $true, true ) ) {

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return true;

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}

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elseif ( in_array( $value, $false, true ) ) {

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return false;

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}

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else {

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return false;

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}

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}

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return false;

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}

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/**

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* Validate a value as integer.

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* @since 1.8.0

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* @param mixed $value Value to validate.

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* @return int|bool Int or false in case of failure to convert to int.

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public static function validate_int( $value ) {

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if ( ! isset( self::$has_filters ) ) {

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self::$has_filters = extension_loaded( 'filter' );

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}

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if ( self::$has_filters ) {

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return filter_var( $value, FILTER_VALIDATE_INT );

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}

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else {

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return self::emulate_filter_int( $value );

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}

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}

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/**

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* Cast a value to integer.

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* @since 1.8.0

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* @param mixed $value Value to cast.

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* @return int|bool

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public static function emulate_filter_int( $value ) {

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if ( is_int( $value ) ) {

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return $value;

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}

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elseif ( is_float( $value ) ) {

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// phpcs:ignore Universal.Operators.StrictComparisons -- Purposeful loose comparison.

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if ( (int) $value == $value && ! is_nan( $value ) ) {

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return (int) $value;

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}

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else {

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return false;

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}

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}

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elseif ( is_string( $value ) ) {

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$value = trim( $value );

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if ( $value === '' ) {

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return false;

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}

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elseif ( ctype_digit( $value ) ) {

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return (int) $value;

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}

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elseif ( strpos( $value, '-' ) === 0 && ctype_digit( substr( $value, 1 ) ) ) {

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return (int) $value;

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}

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else {

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return false;

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}

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}

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return false;

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}

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/**

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* Clears the WP or W3TC cache depending on which is used.

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* @since 1.8.0

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* @return void

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public static function clear_cache() {

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if ( function_exists( 'w3tc_pgcache_flush' ) ) {

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w3tc_pgcache_flush();

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}

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elseif ( function_exists( 'wp_cache_clear_cache' ) ) {

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wp_cache_clear_cache();

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}

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}

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/**

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* Clear rewrite rules.

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* @since 1.8.0

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* @return void

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public static function clear_rewrites() {

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update_option( 'rewrite_rules', '' );

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}

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/**

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* Do simple reliable math calculations without the risk of wrong results.

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* In the rare case that the bcmath extension would not be loaded, it will return the normal calculation results.

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* @link http://floating-point-gui.de/

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* @link http://php.net/language.types.float.php See the big red warning.

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* @since 1.5.0

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* @since 1.8.0 Moved from stand-alone function to this class.

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* @param mixed $number1 Scalar (string/int/float/bool).

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* @param string $action Calculation action to execute. Valid input:

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* '+' or 'add' or 'addition',

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* '-' or 'sub' or 'subtract',

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* '*' or 'mul' or 'multiply',

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* '/' or 'div' or 'divide',

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* '%' or 'mod' or 'modulus'

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* '=' or 'comp' or 'compare'.

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* @param mixed $number2 Scalar (string/int/float/bool).

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* @param bool $round Whether or not to round the result. Defaults to false.

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* Will be disregarded for a compare operation.

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* @param int $decimals Decimals for rounding operation. Defaults to 0.

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* @param int $precision Calculation precision. Defaults to 10.

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* @return mixed Calculation Result or false if either or the numbers isn't scalar or

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* an invalid operation was passed.

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* - For compare the result will always be an integer.

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* - For all other operations, the result will either be an integer (preferred)

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* or a float.

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public static function calc( $number1, $action, $number2, $round = false, $decimals = 0, $precision = 10 ) {

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static $bc;

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if ( ! is_scalar( $number1 ) || ! is_scalar( $number2 ) ) {

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return false;

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}

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if ( ! isset( $bc ) ) {

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$bc = extension_loaded( 'bcmath' );

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}

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if ( $bc ) {

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$number1 = number_format( $number1, 10, '.', '' );

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$number2 = number_format( $number2, 10, '.', '' );

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}

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$result = null;

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$compare = false;

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switch ( $action ) {

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case '+':

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case 'add':

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case 'addition':

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$result = ( $bc ) ? bcadd( $number1, $number2, $precision ) /* string */ : ( $number1 + $number2 );

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break;

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case '-':

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case 'sub':

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case 'subtract':

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$result = ( $bc ) ? bcsub( $number1, $number2, $precision ) /* string */ : ( $number1 - $number2 );

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break;

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