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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 |
---|---|
236 |
|
237 | if ( $delete_all ) { |
238 | foreach ( (array) $object_ids as $o_id ) { |
239 | wp_cache_delete($o_id, $meta_type . '_meta'); |
240 | } |
241 | } else { |
242 | wp_cache_delete($object_id, $meta_type . '_meta'); |
243 | } |
244 |
|
245 | do_action( "deleted_{$meta_type}_meta", $meta_ids, $object_id, $meta_key, $_meta_value ); |
246 |
|
247 | // Old-style action. |
248 | if ( 'post' == $meta_type ) |
249 | do_action( 'deleted_postmeta', $meta_ids ); |
250 |
|
251 | return true; |
252 | } |
253 |
|
254 | /** |
Line | Code |
491 | if ( 'post' == $meta_type || 'comment' == $meta_type ) |
492 | do_action( "delete_{$meta_type}meta", $meta_id ); |
493 |
|
494 | // Run the query, will return true if deleted, false otherwise |
495 | $result = (bool) $wpdb->delete( $table, array( $id_column => $meta_id ) ); |
496 |
|
497 | // Clear the caches. |
498 | wp_cache_delete($object_id, $meta_type . '_meta'); |
499 |
|
500 | do_action( "deleted_{$meta_type}_meta", (array) $meta_id, $object_id, $meta->meta_key, $meta->meta_value ); |
501 |
|
502 | // Old-style action. |
503 | if ( 'post' == $meta_type || 'comment' == $meta_type ) |
504 | do_action( "deleted_{$meta_type}meta", $meta_id ); |
505 |
|
506 | return $result; |
507 |
|
508 | } |
509 |
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