76 lines
1.7 KiB
PHP
76 lines
1.7 KiB
PHP
<?php
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/**
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* WPSEO plugin file.
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*
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* @package WPSEO
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*/
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/**
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* WPSEO_Custom_Fields.
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*/
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class WPSEO_Custom_Fields {
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/**
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* Custom fields cache.
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*
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* @var array
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*/
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protected static $custom_fields = null;
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/**
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* Retrieves the custom field names as an array.
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*
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* @link WordPress core: wp-admin/includes/template.php. Reused query from it.
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*
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* @return array The custom fields.
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*/
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public static function get_custom_fields() {
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global $wpdb;
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// Use cached value if available.
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if ( ! is_null( self::$custom_fields ) ) {
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return self::$custom_fields;
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}
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self::$custom_fields = [];
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/**
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* Filters the number of custom fields to retrieve for the drop-down
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* in the Custom Fields meta box.
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*
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* @param int $limit Number of custom fields to retrieve. Default 30.
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*/
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$limit = apply_filters( 'postmeta_form_limit', 30 );
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$sql = "SELECT DISTINCT meta_key
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FROM $wpdb->postmeta
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WHERE meta_key NOT BETWEEN '_' AND '_z' AND SUBSTRING(meta_key, 1, 1) != '_'
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LIMIT %d";
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$fields = $wpdb->get_col( $wpdb->prepare( $sql, $limit ) );
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/**
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* Filters the custom fields that are auto-completed and replaced as replacement variables
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* in the meta box and sidebar.
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*
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* @param string[] $fields The custom field names.
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*/
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$fields = apply_filters( 'wpseo_replacement_variables_custom_fields', $fields );
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if ( is_array( $fields ) ) {
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self::$custom_fields = array_map( [ 'WPSEO_Custom_Fields', 'add_custom_field_prefix' ], $fields );
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}
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return self::$custom_fields;
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}
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/**
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* Adds the cf_ prefix to a field.
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*
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* @param string $field The field to prefix.
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*
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* @return string The prefixed field.
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*/
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private static function add_custom_field_prefix( $field ) {
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return 'cf_' . $field;
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}
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}
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