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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 |
---|---|
2389 | $meta_value = maybe_serialize($meta_value); |
2390 |
|
2391 | if (empty($meta_value)) { |
2392 | return delete_usermeta($user_id, $meta_key); |
2393 | } |
2394 |
|
2395 | $cur = $wpdb->get_row( $wpdb->prepare("SELECT * FROM $wpdb->usermeta WHERE user_id = %d AND meta_key = %s", $user_id, $meta_key) ); |
2396 |
|
2397 | if ( $cur ) |
2398 | do_action( 'update_usermeta', $cur->umeta_id, $user_id, $meta_key, $meta_value ); |
2399 |
|
2400 | if ( !$cur ) |
2401 | $wpdb->insert($wpdb->usermeta, compact('user_id', 'meta_key', 'meta_value') ); |
2402 | else if ( $cur->meta_value != $meta_value ) |
2403 | $wpdb->update($wpdb->usermeta, compact('meta_value'), compact('user_id', 'meta_key') ); |
2404 | else |
2405 | return false; |
2406 |
|
2407 | clean_user_cache( $user_id ); |