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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) ) |