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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 |
|---|---|
| 2399 | elseif ( $cur->meta_value != $meta_value ) |
| 2400 | $wpdb->update($wpdb->usermeta, compact('meta_value'), compact('user_id', 'meta_key') ); |
| 2401 | else |
| 2402 | return false; |
| 2403 | |
| 2404 | clean_user_cache( $user_id ); |
| 2405 | wp_cache_delete( $user_id, 'user_meta' ); |
| 2406 | |
| 2407 | if ( !$cur ) |
| 2408 | do_action( 'added_usermeta', $wpdb->insert_id, $user_id, $meta_key, $meta_value ); |
| 2409 | else |
| 2410 | do_action( 'updated_usermeta', $cur->umeta_id, $user_id, $meta_key, $meta_value ); |
| 2411 | |
| 2412 | return true; |
| 2413 | } |
| 2414 | |
| 2415 | /** |
| 2416 | * Get users for the blog. |
| 2417 | * |