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add_post_meta( int $post_id, string $meta_key, mixed $meta_value, bool $unique = false )
Adds a meta field to the given post.
Description
Post meta data is called "Custom Fields" on the Administration Screen.
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Parameters
- $post_id
-
(Required) Post ID.
- $meta_key
-
(Required) Metadata name.
- $meta_value
-
(Required) Metadata value. Must be serializable if non-scalar.
- $unique
-
(Optional) Whether the same key should not be added.<br>
Default value: false
Return
(int|false) Meta ID on success, false on failure.
Source
File: wp-includes/post.php
function add_post_meta( $post_id, $meta_key, $meta_value, $unique = false ) {
// Make sure meta is added to the post, not a revision.
if ( $the_post = wp_is_post_revision($post_id) )
$post_id = $the_post;
$added = add_metadata( 'post', $post_id, $meta_key, $meta_value, $unique );
if ( $added ) {
wp_cache_set( 'last_changed', microtime(), 'posts' );
}
return $added;
}
Changelog
| Version | Description |
|---|---|
| 1.5.0 | Introduced. |