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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 |
|---|---|
| 1614 | $nickname = $user_login; |
| 1615 | |
| 1616 | /** |
| 1617 | * Filter a user's nickname before the user is created or updated. |
| 1618 | * |
| 1619 | * @since 2.0.3 |
| 1620 | * |
| 1621 | * @param string $nickname The user's nickname. |
| 1622 | */ |
| 1623 | $nickname = apply_filters( 'pre_user_nickname', $nickname ); |
| 1624 | |
| 1625 | if ( empty($first_name) ) |
| 1626 | $first_name = ''; |
| 1627 | |
| 1628 | /** |
| 1629 | * Filter a user's first name before the user is created or updated. |
| 1630 | * |
| 1631 | * @since 2.0.3 |
| 1632 | * |