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File Content: `class-wpseo-custom-fields.php`

<?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 = [];

		/**
		 * 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' 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;
	}
}

Name	Size	Permission
exceptions	---	0755
options	---	0755
sitemaps	---	0755
class-addon-manager.php	26694 bytes	0644
class-my-yoast-api-request.php	4890 bytes	0644
class-post-type.php	3918 bytes	0644
class-rewrite.php	6951 bytes	0644
class-upgrade-history.php	3126 bytes	0644
class-upgrade.php	55647 bytes	0644
class-wpseo-admin-bar-menu.php	27135 bytes	0644
class-wpseo-content-images.php	2716 bytes	0644
class-wpseo-custom-fields.php	1766 bytes	0644
class-wpseo-custom-taxonomies.php	1628 bytes	0644
class-wpseo-image-utils.php	15453 bytes	0644
class-wpseo-installation.php	1139 bytes	0644
class-wpseo-meta.php	37807 bytes	0644
class-wpseo-primary-term.php	1739 bytes	0644
class-wpseo-rank.php	7350 bytes	0644
class-wpseo-replace-vars.php	52681 bytes	0644
class-wpseo-replacement-variable.php	1375 bytes	0644
class-wpseo-shortlinker.php	1132 bytes	0644
class-wpseo-statistics.php	1443 bytes	0644
class-wpseo-utils.php	29390 bytes	0644
date-helper.php	1752 bytes	0644
index.php	38 bytes	0644
interface-wpseo-wordpress-ajax-integration.php	294 bytes	0644
interface-wpseo-wordpress-integration.php	348 bytes	0644
language-utils.php	2086 bytes	0644
wpseo-functions-deprecated.php	68 bytes	0644
wpseo-functions.php	9218 bytes	0644
wpseo-non-ajax-functions.php	1593 bytes	0644

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

File Content: `class-wpseo-custom-fields.php`