Docs: Clarify return results for a non-existing ID in metadata functions.
[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. Built from https://develop.svn.wordpress.org/trunk@50641 git-svn-id: http://core.svn.wordpress.org/trunk@50253 1a063a9b-81f0-0310-95a4-ce76da25c4cd
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@ -493,10 +493,12 @@ function delete_comment_meta( $comment_id, $meta_key, $meta_value = '' ) {
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* @param string $key Optional. The meta key to retrieve. By default,
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* returns data for all keys.
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* @param bool $single Optional. Whether to return a single value.
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* This parameter has no effect if $key is not specified.
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* This parameter has no effect if `$key` is not specified.
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* Default false.
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* @return mixed An array if $single is false. The value of meta data field
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* if $single is true. False for an invalid $comment_id.
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* @return mixed An array of values if `$single` is false.
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* The value of meta data field if `$single` is true.
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* False for an invalid `$comment_id` (non-numeric, zero, or negative value).
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* An empty string if a valid but non-existing comment ID is passed.
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*/
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function get_comment_meta( $comment_id, $key = '', $single = false ) {
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return get_metadata( 'comment', $comment_id, $key, $single );
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@ -497,10 +497,13 @@ function delete_metadata( $meta_type, $object_id, $meta_key, $meta_value = '', $
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* @param int $object_id ID of the object metadata is for.
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* @param string $meta_key Optional. Metadata key. If not specified, retrieve all metadata for
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* the specified object. Default empty.
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* @param bool $single Optional. If true, return only the first value of the specified meta_key.
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* This parameter has no effect if meta_key is not specified. Default false.
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* @return mixed Single metadata value, or array of values.
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* False if there's a problem with the parameters passed to the function.
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* @param bool $single Optional. If true, return only the first value of the specified `$meta_key`.
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* This parameter has no effect if `$meta_key` is not specified. Default false.
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* @return mixed An array of values if `$single` is false.
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* The value of the meta field if `$single` is true.
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* False for an invalid `$object_id` (non-numeric, zero, or negative value),
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* or if `$meta_type` is not specified.
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* An empty string if a valid but non-existing object ID is passed.
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*/
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function get_metadata( $meta_type, $object_id, $meta_key = '', $single = false ) {
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$value = get_metadata_raw( $meta_type, $object_id, $meta_key, $single );
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@ -521,10 +524,13 @@ function get_metadata( $meta_type, $object_id, $meta_key = '', $single = false )
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* @param int $object_id ID of the object metadata is for.
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* @param string $meta_key Optional. Metadata key. If not specified, retrieve all metadata for
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* the specified object. Default empty.
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* @param bool $single Optional. If true, return only the first value of the specified meta_key.
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* This parameter has no effect if meta_key is not specified. Default false.
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* @return mixed Single metadata value, or array of values. Null if the value does not exist.
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* False if there's a problem with the parameters passed to the function.
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* @param bool $single Optional. If true, return only the first value of the specified `$meta_key`.
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* This parameter has no effect if `$meta_key` is not specified. Default false.
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* @return mixed An array of values if `$single` is false.
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* The value of the meta field if `$single` is true.
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* False for an invalid `$object_id` (non-numeric, zero, or negative value),
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* or if `$meta_type` is not specified.
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* Null if the value does not exist.
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*/
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function get_metadata_raw( $meta_type, $object_id, $meta_key = '', $single = false ) {
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if ( ! $meta_type || ! is_numeric( $object_id ) ) {
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@ -608,9 +614,10 @@ function get_metadata_raw( $meta_type, $object_id, $meta_key = '', $single = fal
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* or any other object type with an associated meta table.
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* @param int $object_id ID of the object metadata is for.
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* @param string $meta_key Metadata key.
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* @param bool $single Optional. If true, return only the first value of the specified meta_key.
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* This parameter has no effect if meta_key is not specified. Default false.
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* @return mixed Single metadata value, or array of values.
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* @param bool $single Optional. If true, return only the first value of the specified `$meta_key`.
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* This parameter has no effect if `$meta_key` is not specified. Default false.
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* @return mixed An array of default values if `$single` is false.
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* The default value of the meta field if `$single` is true.
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*/
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function get_metadata_default( $meta_type, $object_id, $meta_key, $single = false ) {
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if ( $single ) {
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@ -1401,11 +1408,12 @@ function register_meta( $object_type, $meta_key, $args, $deprecated = null ) {
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* @param mixed $value Current value passed to filter.
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* @param int $object_id ID of the object metadata is for.
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* @param string $meta_key Metadata key.
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* @param bool $single If true, return only the first value of the specified meta_key.
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* This parameter has no effect if meta_key is not specified.
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* @param bool $single If true, return only the first value of the specified `$meta_key`.
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* This parameter has no effect if `$meta_key` is not specified.
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* @param string $meta_type Type of object metadata is for. Accepts 'post', 'comment', 'term', 'user',
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* or any other object type with an associated meta table.
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* @return mixed Single metadata default, or array of defaults.
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* @return mixed An array of default values if `$single` is false.
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* The default value of the meta field if `$single` is true.
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*/
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function filter_default_metadata( $value, $object_id, $meta_key, $single, $meta_type ) {
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global $wp_meta_keys;
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@ -1084,10 +1084,12 @@ function delete_site_meta( $site_id, $meta_key, $meta_value = '' ) {
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* @param string $key Optional. The meta key to retrieve. By default,
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* returns data for all keys. Default empty.
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* @param bool $single Optional. Whether to return a single value.
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* This parameter has no effect if $key is not specified.
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* This parameter has no effect if `$key` is not specified.
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* Default false.
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* @return mixed An array if $single is false. The value of meta data field
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* if $single is true. False for an invalid $site_id.
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* @return mixed An array of values if `$single` is false.
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* The value of meta data field if `$single` is true.
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* False for an invalid `$site_id` (non-numeric, zero, or negative value).
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* An empty string if a valid but non-existing site ID is passed.
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*/
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function get_site_meta( $site_id, $key = '', $single = false ) {
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return get_metadata( 'blog', $site_id, $key, $single );
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@ -2236,10 +2236,12 @@ function delete_post_meta( $post_id, $meta_key, $meta_value = '' ) {
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* @param string $key Optional. The meta key to retrieve. By default,
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* returns data for all keys. Default empty.
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* @param bool $single Optional. Whether to return a single value.
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* This parameter has no effect if $key is not specified.
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* This parameter has no effect if `$key` is not specified.
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* Default false.
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* @return mixed An array if $single is false. The value of the meta field
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* if $single is true. False for an invalid $post_id.
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* @return mixed An array of values if `$single` is false.
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* The value of the meta field if `$single` is true.
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* False for an invalid `$post_id` (non-numeric, zero, or negative value).
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* An empty string if a valid but non-existing post ID is passed.
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*/
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function get_post_meta( $post_id, $key = '', $single = false ) {
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return get_metadata( 'post', $post_id, $key, $single );
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@ -1324,10 +1324,12 @@ function delete_term_meta( $term_id, $meta_key, $meta_value = '' ) {
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* @param string $key Optional. The meta key to retrieve. By default,
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* returns data for all keys. Default empty.
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* @param bool $single Optional. Whether to return a single value.
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* This parameter has no effect if $key is not specified.
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* This parameter has no effect if `$key` is not specified.
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* Default false.
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* @return mixed An array if $single is false. The value of the meta field
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* if $single is true. False for an invalid $term_id.
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* @return mixed An array of values if `$single` is false.
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* The value of the meta field if `$single` is true.
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* False for an invalid `$term_id` (non-numeric, zero, or negative value).
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* An empty string if a valid but non-existing term ID is passed.
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*/
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function get_term_meta( $term_id, $key = '', $single = false ) {
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return get_metadata( 'term', $term_id, $key, $single );
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@ -1008,10 +1008,12 @@ function delete_user_meta( $user_id, $meta_key, $meta_value = '' ) {
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* @param string $key Optional. The meta key to retrieve. By default,
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* returns data for all keys.
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* @param bool $single Optional. Whether to return a single value.
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* This parameter has no effect if $key is not specified.
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* This parameter has no effect if `$key` is not specified.
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* Default false.
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* @return mixed An array if $single is false. The value of meta data field
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* if $single is true. False for an invalid $user_id.
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* @return mixed An array of values if `$single` is false.
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* The value of meta data field if `$single` is true.
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* False for an invalid `$user_id` (non-numeric, zero, or negative value).
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* An empty string if a valid but non-existing user ID is passed.
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*/
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function get_user_meta( $user_id, $key = '', $single = false ) {
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return get_metadata( 'user', $user_id, $key, $single );
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@ -13,7 +13,7 @@
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*
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* @global string $wp_version
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*/
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$wp_version = '5.8-alpha-50634';
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$wp_version = '5.8-alpha-50641';
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/**
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* Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.
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