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Edit File: class-wpseo-custom-fields.php

<?php /** * WPSEO plugin file. * * @package WPSEO */ /** * WPSEO_Custom_Fields. */ class WPSEO_Custom_Fields { /** * Custom fields cache. * * @var array|null */ protected static $custom_fields = null; /** * Retrieves the custom field names as an array. * * @link WordPress core: wp-admin/includes/template.php. Reused query from it. * * @return array The custom fields. */ public static function get_custom_fields() { global $wpdb; // Use cached value if available. if ( self::$custom_fields !== null ) { return self::$custom_fields; } self::$custom_fields = []; /** * Filters the number of custom fields to retrieve for the drop-down * in the Custom Fields meta box. * * @param int $limit Number of custom fields to retrieve. Default 30. */ $limit = apply_filters( 'postmeta_form_limit', 30 ); /** * Filter: 'wpseo_custom_fields_pre_query' - Filters the custom-fields lookup before the database query runs. * * Returning a non-null array short-circuits the default `SELECT DISTINCT meta_key` * query against `wp_postmeta`. On very large postmeta tables this can be a way * to supply a pre-cached list or an alternative query to improve loading times. * * @param string[]|null $custom_fields Pre-computed list of meta_key names, or null to run the default query. * @param int $limit The configured result limit; honor it if running a custom query. */ $fields = apply_filters( 'wpseo_custom_fields_pre_query', null, $limit ); if ( ! is_array( $fields ) ) { $sql = "SELECT DISTINCT meta_key FROM $wpdb->postmeta WHERE meta_key NOT BETWEEN '_' AND '_z' AND SUBSTRING(meta_key, 1, 1) != '_' LIMIT %d"; $fields = $wpdb->get_col( $wpdb->prepare( $sql, $limit ) ); } /** * Filters the custom fields that are auto-completed and replaced as replacement variables * in the meta box and sidebar. * * @param string[] $fields The custom field names. */ $fields = apply_filters( 'wpseo_replacement_variables_custom_fields', $fields ); if ( is_array( $fields ) ) { self::$custom_fields = array_map( [ 'WPSEO_Custom_Fields', 'add_custom_field_prefix' ], $fields ); } return self::$custom_fields; } /** * Adds the cf_ prefix to a field. * * @param string $field The field to prefix. * * @return string The prefixed field. */ private static function add_custom_field_prefix( $field ) { return 'cf_' . $field; } }