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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 |
|---|---|
| 1721 | /** |
| 1722 | * Filter a username after it has been sanitized. |
| 1723 | * |
| 1724 | * This filter is called before the user is created or updated. |
| 1725 | * |
| 1726 | * @since 2.0.3 |
| 1727 | * |
| 1728 | * @param string $sanitized_user_login Username after it has been sanitized. |
| 1729 | */ |
| 1730 | $pre_user_login = apply_filters( 'pre_user_login', $sanitized_user_login ); |
| 1731 | |
| 1732 | //Remove any non-printable chars from the login string to see if we have ended up with an empty username |
| 1733 | $user_login = trim( $pre_user_login ); |
| 1734 | |
| 1735 | if ( empty( $user_login ) ) { |
| 1736 | return new WP_Error('empty_user_login', __('Cannot create a user with an empty login name.') ); |
| 1737 | } |
| 1738 | if ( ! $update && username_exists( $user_login ) ) { |
| 1739 | return new WP_Error( 'existing_user_login', __( 'Sorry, that username already exists!' ) ); |