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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 |
|---|---|
| 2301 | $meta_value = maybe_serialize($meta_value); |
| 2302 | |
| 2303 | if (empty($meta_value)) { |
| 2304 | return delete_usermeta($user_id, $meta_key); |
| 2305 | } |
| 2306 | |
| 2307 | $cur = $wpdb->get_row( $wpdb->prepare("SELECT * FROM $wpdb->usermeta WHERE user_id = %d AND meta_key = %s", $user_id, $meta_key) ); |
| 2308 | |
| 2309 | if ( $cur ) |
| 2310 | do_action( 'update_usermeta', $cur->umeta_id, $user_id, $meta_key, $meta_value ); |
| 2311 | |
| 2312 | if ( !$cur ) |
| 2313 | $wpdb->insert($wpdb->usermeta, compact('user_id', 'meta_key', 'meta_value') ); |
| 2314 | elseif ( $cur->meta_value != $meta_value ) |
| 2315 | $wpdb->update($wpdb->usermeta, compact('meta_value'), compact('user_id', 'meta_key') ); |
| 2316 | else |
| 2317 | return false; |
| 2318 | |
| 2319 | clean_user_cache( $user_id ); |