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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 |
|---|---|
| 1652 | if ( $update ) { |
| 1653 | /** |
| 1654 | * Fires immediately after an existing user is updated. |
| 1655 | * |
| 1656 | * @since 2.0.0 |
| 1657 | * |
| 1658 | * @param int $user_id User ID. |
| 1659 | * @param object $old_user_data Object containing user's data prior to update. |
| 1660 | */ |
| 1661 | do_action( 'profile_update', $user_id, $old_user_data ); |
| 1662 | } else { |
| 1663 | /** |
| 1664 | * Fires immediately after a new user is registered. |
| 1665 | * |
| 1666 | * @since 1.5.0 |
| 1667 | * |
| 1668 | * @param int $user_id User ID. |
| 1669 | */ |
| 1670 | do_action( 'user_register', $user_id ); |