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<?php
/**
* WPSEO plugin file.
*
* @package WPSEO
*/
/**
* WPSEO_Custom_Fields.
*/
class WPSEO_Custom_Fields {
/**
* Custom fields cache.
*
* @var array
*/
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 $wpdb;
// Use cached value if available.
if ( ! is_null( self::$custom_fields ) ) {
return self::$custom_fields;
}
self::$custom_fields = array();
/**
* 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 );
$sql = "SELECT DISTINCT meta_key
FROM $wpdb->postmeta
WHERE meta_key NOT BETWEEN '_' AND '_z'
HAVING meta_key NOT LIKE %s
ORDER BY meta_key
LIMIT %d";
$fields = $wpdb->get_col( $wpdb->prepare( $sql, $wpdb->esc_like( '_' ) . '%', $limit ) );
if ( is_array( $fields ) ) {
self::$custom_fields = array_map( array( '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;
}
}
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