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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 |
|---|---|
| 32 | |
| 33 | $wpdb->insert( $table, array( |
| 34 | $column => $object_id, |
| 35 | 'meta_key' => $meta_key, |
| 36 | 'meta_value' => $meta_value |
| 37 | ) ); |
| 38 | |
| 39 | wp_cache_delete($object_id, $meta_type . '_meta'); |
| 40 | |
| 41 | do_action( "added_{$meta_type}_meta", $wpdb->insert_id, $object_id, $meta_key, $meta_value ); |
| 42 | |
| 43 | return true; |
| 44 | } |
| 45 | |
| 46 | function update_metadata($meta_type, $object_id, $meta_key, $meta_value, $prev_value = '') { |
| 47 | if ( !$meta_type || !$meta_key ) |
| 48 | return false; |
| 49 | |
| 50 | if ( ! $table = _get_meta_table($meta_type) ) |