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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 |
|---|---|
| 1673 | if ( $update ) { |
| 1674 | /** |
| 1675 | * Fires immediately after an existing user is updated. |
| 1676 | * |
| 1677 | * @since 2.0.0 |
| 1678 | * |
| 1679 | * @param int $user_id User ID. |
| 1680 | * @param object $old_user_data Object containing user's data prior to update. |
| 1681 | */ |
| 1682 | do_action( 'profile_update', $user_id, $old_user_data ); |
| 1683 | } else { |
| 1684 | /** |
| 1685 | * Fires immediately after a new user is registered. |
| 1686 | * |
| 1687 | * @since 1.5.0 |
| 1688 | * |
| 1689 | * @param int $user_id User ID. |
| 1690 | */ |
| 1691 | do_action( 'user_register', $user_id ); |