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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 |
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1722 | $nickname = empty( $userdata['nickname'] ) ? $user_login : $userdata['nickname']; |
1723 |
|
1724 | /** |
1725 | * Filter a user's nickname before the user is created or updated. |
1726 | * |
1727 | * @since 2.0.3 |
1728 | * |
1729 | * @param string $nickname The user's nickname. |
1730 | */ |
1731 | $meta['nickname'] = apply_filters( 'pre_user_nickname', $nickname ); |
1732 |
|
1733 | $first_name = empty( $userdata['first_name'] ) ? '' : $userdata['first_name']; |
1734 |
|
1735 | /** |
1736 | * Filter a user's first name before the user is created or updated. |
1737 | * |
1738 | * @since 2.0.3 |
1739 | * |
1740 | * @param string $first_name The user's first name. |