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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 |
|---|---|
| 1556 | if ( $update ) { |
| 1557 | /** |
| 1558 | * Fires immediately after an existing user is updated. |
| 1559 | * |
| 1560 | * @since 2.0.0 |
| 1561 | * |
| 1562 | * @param int $user_id User ID. |
| 1563 | * @param object $old_user_data Object containing user's data prior to update. |
| 1564 | */ |
| 1565 | do_action( 'profile_update', $user_id, $old_user_data ); |
| 1566 | } else { |
| 1567 | /** |
| 1568 | * Fires immediately after a new user is registered. |
| 1569 | * |
| 1570 | * @since 1.5.0 |
| 1571 | * |
| 1572 | * @param int $user_id User ID. |
| 1573 | */ |
| 1574 | do_action( 'user_register', $user_id ); |