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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 |
---|---|
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 | * |
1633 | * @param string $first_name The user's first name. |
1634 | */ |
1635 | $first_name = apply_filters( 'pre_user_first_name', $first_name ); |
1636 |
|
1637 | if ( empty($last_name) ) |
1638 | $last_name = ''; |
1639 |
|
1640 | /** |
1641 | * Filter a user's last name before the user is created or updated. |
1642 | * |
1643 | * @since 2.0.3 |
1644 | * |