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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 |
---|---|
52 |
|
53 | if ( $unique && $wpdb->get_var( $wpdb->prepare( |
54 | "SELECT COUNT(*) FROM $table WHERE meta_key = %s AND $column = %d", |
55 | $meta_key, $object_id ) ) ) |
56 | return false; |
57 |
|
58 | $_meta_value = $meta_value; |
59 | $meta_value = maybe_serialize( $meta_value ); |
60 |
|
61 | do_action( "add_{$meta_type}_meta", $object_id, $meta_key, $_meta_value ); |
62 |
|
63 | $wpdb->insert( $table, array( |
64 | $column => $object_id, |
65 | 'meta_key' => $meta_key, |
66 | 'meta_value' => $meta_value |
67 | ) ); |
68 |
|
69 | wp_cache_delete($object_id, $meta_type . '_meta'); |
70 | // users cache stores usermeta that must be cleared. |