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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.
| Line | Code |
|---|---|
| 355 | // Old-style action. |
| 356 | if ( 'post' == $meta_type ) { |
| 357 | /** |
| 358 | * Fires immediately before deleting metadata for a post. |
| 359 | * |
| 360 | * @since 2.9.0 |
| 361 | * |
| 362 | * @param array $meta_ids An array of post metadata entry IDs to delete. |
| 363 | */ |
| 364 | do_action( 'delete_postmeta', $meta_ids ); |
| 365 | } |
| 366 | |
| 367 | $query = "DELETE FROM $table WHERE $id_column IN( " . implode( ',', $meta_ids ) . " )"; |
| 368 | |
| 369 | $count = $wpdb->query($query); |
| 370 | |
| 371 | if ( !$count ) |
| 372 | return false; |
| 373 | |