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<?php

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if ( ! function_exists( '_sanitize_text_fields' ) ):

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/**

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* Internal helper function to sanitize a string from user input or from the db

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* @since 4.7.0

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* @access private

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* @param string $str String to sanitize.

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* @param bool $keep_newlines optional Whether to keep newlines. Default: false.

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* @return string Sanitized string.

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function _sanitize_text_fields( $str, $keep_newlines = false ) {

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$filtered = wp_check_invalid_utf8( $str );

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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, false );

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// Use html entities in a special case to make sure no later

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// newline stripping stage could lead to a functional tag

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$filtered = str_replace( "<\n", "<\n", $filtered );

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}

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if ( ! $keep_newlines ) {

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

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}

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$filtered = trim( $filtered );

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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[0], '', $filtered );

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$found = true;

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}

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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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return $filtered;

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}

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endif;

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if ( ! function_exists( 'get_site' ) ):

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/**

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* Retrieves site data given a site ID or site object.

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* Site data will be cached and returned after being passed through a filter.

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* If the provided site is empty, the current site global will be used.

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* @since 4.6.0

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* @param WP_Site|int|null $site Optional. Site to retrieve. Default is the current site.

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* @return WP_Site|null The site object or null if not found.

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function get_site( $site = null ) {

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if ( empty( $site ) ) {

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$site = get_current_blog_id();

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}

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if ( $site instanceof WP_Site ) {

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$_site = $site;

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} elseif ( is_object( $site ) ) {

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$_site = new WP_Site( $site );

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} else {

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$_site = WP_Site::get_instance( $site );

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}

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if ( ! $_site ) {

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return null;

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}

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/**

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* Fires after a site is retrieved.

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* @since 4.6.0

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* @param WP_Site $_site Site data.

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$_site = apply_filters( 'get_site', $_site );

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return $_site;

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}

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endif;

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if ( ! function_exists( 'sanitize_textarea_field' ) ):

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/**

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* Sanitizes a multiline string from user input or from the database.

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* The function is like sanitize_text_field(), but preserves

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* new lines (\n) and other whitespace, which are legitimate

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* input in textarea elements.

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* @see sanitize_text_field()

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* @since 4.7.0

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* @param string $str String to sanitize.

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* @return string Sanitized string.

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function sanitize_textarea_field( $str ) {

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$filtered = _sanitize_text_fields( $str, true );

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/**

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* Filters a sanitized textarea field string.

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* @since 4.7.0

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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_textarea_field', $filtered, $str );

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}

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endif;

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if ( ! function_exists( 'wp_doing_ajax' ) ):

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function wp_doing_ajax() {

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/**

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* Filters whether the current request is an Ajax request.

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* @since 4.7.0

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* @param bool $wp_doing_ajax Whether the current request is an Ajax request.

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return apply_filters( 'wp_doing_ajax', defined( 'DOING_AJAX' ) && DOING_AJAX );

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}

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endif;

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if ( ! function_exists( 'wp_doing_cron' ) ):

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function wp_doing_cron() {

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/**

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* Filters whether the current request is a WordPress cron request.

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* @since 4.8.0

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* @param bool $wp_doing_cron Whether the current request is a WordPress cron request.

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return apply_filters( 'wp_doing_cron', defined( 'DOING_CRON' ) && DOING_CRON );

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}

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endif;

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if ( ! function_exists( 'has_block' ) ):

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/**

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* Placeholder for real WP function that exists when GB is installed, i.e. WP >= 5.0

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* It would determine whether a $post or a string contains a specific block type.

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* @see has_block()

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* @since 4.2

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* @return bool forced false result.

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function has_block() {

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return false;

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}

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endif;

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