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<?php

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/**

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* WPSEO plugin file.

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* @package WPSEO

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/**

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* WPSEO_Custom_Fields.

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class WPSEO_Custom_Fields {

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/**

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* Custom fields cache.

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* @var array

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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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* @link WordPress core: wp-admin/includes/template.php. Reused query from it.

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* @return array The custom fields.

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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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* @param int $limit Number of custom fields to retrieve. Default 30.

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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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* @param string[] $fields The custom field names.

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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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* @param string $field The field to prefix.

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* @return string The prefixed field.

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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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