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The best way to understand what a hook does is to look at where it occurs in the source code.
do_action( "hook_name" )
apply_filters( "hook_name", "what_to_filter" )
.Remember, this hook may occur in more than one file. Moreover, the hook's context may change from version to version.
This hook occurs 2 times in this file.
Line | Code |
---|---|
205 | * object type (comment, post, or user). |
206 | * |
207 | * @since 2.9.0 |
208 | * |
209 | * @param int $meta_id ID of the metadata entry to update. |
210 | * @param int $object_id Object ID. |
211 | * @param string $meta_key Meta key. |
212 | * @param mixed $meta_value Meta value. |
213 | */ |
214 | do_action( "update_{$meta_type}_meta", $meta_id, $object_id, $meta_key, $_meta_value ); |
215 |
|
216 | if ( 'post' == $meta_type ) |
217 | /** |
218 | * Fires immediately before updating a post's metadata. |
219 | * |
220 | * @since 2.9.0 |
221 | * |
222 | * @param int $meta_id ID of metadata entry to update. |
223 | * @param int $object_id Object ID. |
Line | Code |
599 | 'meta_key' => $meta_key, |
600 | 'meta_value' => $meta_value |
601 | ); |
602 |
|
603 | // Format the where query arguments. |
604 | $where = array(); |
605 | $where[$id_column] = $meta_id; |
606 |
|
607 | /** This action is documented in wp-includes/meta.php */ |
608 | do_action( "update_{$meta_type}_meta", $meta_id, $object_id, $meta_key, $_meta_value ); |
609 |
|
610 | if ( 'post' == $meta_type ) { |
611 | /** This action is documented in wp-includes/meta.php */ |
612 | do_action( 'update_postmeta', $meta_id, $object_id, $meta_key, $meta_value ); |
613 | } |
614 |
|
615 | // Run the update query, all fields in $data are %s, $where is a %d. |
616 | $result = $wpdb->update( $table, $data, $where, '%s', '%d' ); |
617 | if ( ! $result ) |