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📁 ..
📄 class-addon-manager.php(26.21 KB)
📄 class-my-yoast-api-request.php(4.77 KB)
📄 class-post-type.php(3.89 KB)
📄 class-rewrite.php(7.58 KB)
📄 class-upgrade-history.php(3.04 KB)
📄 class-upgrade.php(55.17 KB)
📄 class-wpseo-admin-bar-menu.php(26.55 KB)
📄 class-wpseo-content-images.php(2.62 KB)
📄 class-wpseo-custom-fields.php(1.73 KB)
📄 class-wpseo-custom-taxonomies.php(1.59 KB)
📄 class-wpseo-image-utils.php(15.09 KB)
📄 class-wpseo-installation.php(1.11 KB)
📄 class-wpseo-meta.php(34.17 KB)
📄 class-wpseo-primary-term.php(1.7 KB)
📄 class-wpseo-rank.php(7.37 KB)
📄 class-wpseo-replace-vars.php(51.41 KB)
📄 class-wpseo-replacement-variable.php(1.34 KB)
📄 class-wpseo-shortlinker.php(1.11 KB)
📄 class-wpseo-statistics.php(1.41 KB)
📄 class-wpseo-utils.php(28.49 KB)
📄 class-yoast-dynamic-rewrites.php(5.24 KB)
📄 date-helper.php(1.71 KB)
📁 exceptions
📄 index.php(38 B)
📄 interface-wpseo-wordpress-ajax-integration.php(294 B)
📄 interface-wpseo-wordpress-integration.php(348 B)
📄 language-utils.php(1.28 KB)
📁 options
📁 sitemaps
📄 wpseo-functions-deprecated.php(68 B)
📄 wpseo-functions.php(9 KB)
📄 wpseo-non-ajax-functions.php(1.56 KB)

Editing: 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 );
		$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;
	}
}

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Editing: class-wpseo-custom-fields.php

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