wordpress-seo / inc / class-wpseo-custom-fields.php

class-wpseo-custom-fields.php in Yoast SEO – Advanced SEO with real-time guidance and built-in AI 18.8, at inc/class-wpseo-custom-fields.php

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1	<?php
2	/**
3	* WPSEO plugin file.
4	*
5	* @package WPSEO
6	*/
7
8	/**
9	* WPSEO_Custom_Fields.
10	*/
11	class WPSEO_Custom_Fields {
12
13	/**
14	* Custom fields cache.
15	*
16	* @var array
17	*/
18	protected static $custom_fields = null;
19
20	/**
21	* Retrieves the custom field names as an array.
22	*
23	* @link WordPress core: wp-admin/includes/template.php. Reused query from it.
24	*
25	* @return array The custom fields.
26	*/
27	public static function get_custom_fields() {
28	global $wpdb;
29
30	// Use cached value if available.
31	if ( ! is_null( self::$custom_fields ) ) {
32	return self::$custom_fields;
33	}
34
35	self::$custom_fields = [];
36
37	/**
38	* Filters the number of custom fields to retrieve for the drop-down
39	* in the Custom Fields meta box.
40	*
41	* @param int $limit Number of custom fields to retrieve. Default 30.
42	*/
43	$limit = apply_filters( 'postmeta_form_limit', 30 );
44	$sql = "SELECT DISTINCT meta_key
45	FROM $wpdb->postmeta
46	WHERE meta_key NOT BETWEEN '_' AND '_z' AND SUBSTRING(meta_key, 1, 1) != '_'
47	LIMIT %d";
48	$fields = $wpdb->get_col( $wpdb->prepare( $sql, $limit ) );
49
50	if ( is_array( $fields ) ) {
51	self::$custom_fields = array_map( [ 'WPSEO_Custom_Fields', 'add_custom_field_prefix' ], $fields );
52	}
53
54	return self::$custom_fields;
55	}
56
57	/**
58	* Adds the cf_ prefix to a field.
59	*
60	* @param string $field The field to prefix.
61	*
62	* @return string The prefixed field.
63	*/
64	private static function add_custom_field_prefix( $field ) {
65	return 'cf_' . $field;
66	}
67	}
68