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Docs: Clarify return results for a non-existing ID in metadata functions.

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[48658] documented that various metadata functions return false for an invalid ID. However, that does not clarify what an invalid ID is: a non-numeric, zero, or negative value. This change adds the clarification in all relevant metadata function docblocks.

Props icopydoc, SergeyBiryukov, davidkryzaniak, audrasjb.
Fixes #51797.

git-svn-id: https://develop.svn.wordpress.org/trunk@50641 602fd350-edb4-49c9-b593-d223f7449a82
This commit is contained in:
David Baumwald
2021-04-02 15:47:34 +00:00
parent e80e9c4acb
commit 3bb06ce10b
6 changed files with 47 additions and 29 deletions
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36
src/wp-includes/meta.php
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@@ -497,10 +497,13 @@ function delete_metadata( $meta_type, $object_id, $meta_key, $meta_value = '', $
* @param int $object_id ID of the object metadata is for.
* @param string $meta_key Optional. Metadata key. If not specified, retrieve all metadata for
* the specified object. Default empty.
* @param bool $single Optional. If true, return only the first value of the specified meta_key.
* This parameter has no effect if meta_key is not specified. Default false.
* @return mixed Single metadata value, or array of values.
* False if there's a problem with the parameters passed to the function.
* @param bool $single Optional. If true, return only the first value of the specified `$meta_key`.
* This parameter has no effect if `$meta_key` is not specified. Default false.
* @return mixed An array of values if `$single` is false.
* The value of the meta field if `$single` is true.
* False for an invalid `$object_id` (non-numeric, zero, or negative value),
* or if `$meta_type` is not specified.
* An empty string if a valid but non-existing object ID is passed.
*/
function get_metadata( $meta_type, $object_id, $meta_key = '', $single = false ) {
$value = get_metadata_raw( $meta_type, $object_id, $meta_key, $single );
@@ -521,10 +524,13 @@ function get_metadata( $meta_type, $object_id, $meta_key = '', $single = false )
* @param int $object_id ID of the object metadata is for.
* @param string $meta_key Optional. Metadata key. If not specified, retrieve all metadata for
* the specified object. Default empty.
* @param bool $single Optional. If true, return only the first value of the specified meta_key.
* This parameter has no effect if meta_key is not specified. Default false.
* @return mixed Single metadata value, or array of values. Null if the value does not exist.
* False if there's a problem with the parameters passed to the function.
* @param bool $single Optional. If true, return only the first value of the specified `$meta_key`.
* This parameter has no effect if `$meta_key` is not specified. Default false.
* @return mixed An array of values if `$single` is false.
* The value of the meta field if `$single` is true.
* False for an invalid `$object_id` (non-numeric, zero, or negative value),
* or if `$meta_type` is not specified.
* Null if the value does not exist.
*/
function get_metadata_raw( $meta_type, $object_id, $meta_key = '', $single = false ) {
if ( ! $meta_type || ! is_numeric( $object_id ) ) {
@@ -608,9 +614,10 @@ function get_metadata_raw( $meta_type, $object_id, $meta_key = '', $single = fal
* or any other object type with an associated meta table.
* @param int $object_id ID of the object metadata is for.
* @param string $meta_key Metadata key.
* @param bool $single Optional. If true, return only the first value of the specified meta_key.
* This parameter has no effect if meta_key is not specified. Default false.
* @return mixed Single metadata value, or array of values.
* @param bool $single Optional. If true, return only the first value of the specified `$meta_key`.
* This parameter has no effect if `$meta_key` is not specified. Default false.
* @return mixed An array of default values if `$single` is false.
* The default value of the meta field if `$single` is true.
*/
function get_metadata_default( $meta_type, $object_id, $meta_key, $single = false ) {
if ( $single ) {
@@ -1401,11 +1408,12 @@ function register_meta( $object_type, $meta_key, $args, $deprecated = null ) {
* @param mixed $value Current value passed to filter.
* @param int $object_id ID of the object metadata is for.
* @param string $meta_key Metadata key.
* @param bool $single If true, return only the first value of the specified meta_key.
* This parameter has no effect if meta_key is not specified.
* @param bool $single If true, return only the first value of the specified `$meta_key`.
* This parameter has no effect if `$meta_key` is not specified.
* @param string $meta_type Type of object metadata is for. Accepts 'post', 'comment', 'term', 'user',
* or any other object type with an associated meta table.
* @return mixed Single metadata default, or array of defaults.
* @return mixed An array of default values if `$single` is false.
* The default value of the meta field if `$single` is true.
*/
function filter_default_metadata( $value, $object_id, $meta_key, $single, $meta_type ) {
global $wp_meta_keys;