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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 |
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217 | $query .= $wpdb->prepare(" AND meta_value = %s", $meta_value ); |
218 |
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219 | $meta_ids = $wpdb->get_col( $query ); |
220 | if ( !count( $meta_ids ) ) |
221 | return false; |
222 |
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223 | if ( $delete_all ) |
224 | $object_ids = $wpdb->get_col( $wpdb->prepare( "SELECT $type_column FROM $table WHERE meta_key = %s", $meta_key ) ); |
225 |
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226 | do_action( "delete_{$meta_type}_meta", $meta_ids, $object_id, $meta_key, $_meta_value ); |
227 |
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228 | // Old-style action. |
229 | if ( 'post' == $meta_type ) |
230 | do_action( 'delete_postmeta', $meta_ids ); |
231 |
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232 | $query = "DELETE FROM $table WHERE $id_column IN( " . implode( ',', $meta_ids ) . " )"; |
233 |
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234 | $count = $wpdb->query($query); |
235 |
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Line | Code |
483 |
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484 | // object and id columns |
485 | $column = sanitize_key($meta_type . '_id'); |
486 | $id_column = 'user' == $meta_type ? 'umeta_id' : 'meta_id'; |
487 |
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488 | // Fetch the meta and go on if it's found. |
489 | if ( $meta = get_metadata_by_mid( $meta_type, $meta_id ) ) { |
490 | $object_id = $meta->{$column}; |
491 |
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492 | do_action( "delete_{$meta_type}_meta", (array) $meta_id, $object_id, $meta->meta_key, $meta->meta_value ); |
493 |
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494 | // Old-style action. |
495 | if ( 'post' == $meta_type || 'comment' == $meta_type ) |
496 | do_action( "delete_{$meta_type}meta", $meta_id ); |
497 |
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498 | // Run the query, will return true if deleted, false otherwise |
499 | $result = (bool) $wpdb->delete( $table, array( $id_column => $meta_id ) ); |
500 |
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501 | // Clear the caches. |