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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.
This hook occurs 2 times in this file.
| Line | Code |
|---|---|
| 1793 | } |
| 1794 | |
| 1795 | /** |
| 1796 | * Filters the list of disallowed usernames. |
| 1797 | * |
| 1798 | * @since 4.4.0 |
| 1799 | * |
| 1800 | * @param array $usernames Array of disallowed usernames. |
| 1801 | */ |
| 1802 | $illegal_logins = (array) apply_filters( 'illegal_user_logins', array() ); |
| 1803 | |
| 1804 | if ( in_array( strtolower( $user_login ), array_map( 'strtolower', $illegal_logins ), true ) ) { |
| 1805 | return new WP_Error( 'invalid_username', __( 'Sorry, that username is not allowed.' ) ); |
| 1806 | } |
| 1807 | |
| 1808 | /* |
| 1809 | * If a nicename is provided, remove unsafe user characters before using it. |
| 1810 | * Otherwise build a nicename from the user_login. |
| 1811 | */ |
| Line | Code |
| 2893 | $errors->add( 'empty_username', __( '<strong>Error</strong>: Please enter a username.' ) ); |
| 2894 | } elseif ( ! validate_username( $user_login ) ) { |
| 2895 | $errors->add( 'invalid_username', __( '<strong>Error</strong>: This username is invalid because it uses illegal characters. Please enter a valid username.' ) ); |
| 2896 | $sanitized_user_login = ''; |
| 2897 | } elseif ( username_exists( $sanitized_user_login ) ) { |
| 2898 | $errors->add( 'username_exists', __( '<strong>Error</strong>: This username is already registered. Please choose another one.' ) ); |
| 2899 | |
| 2900 | } else { |
| 2901 | /** This filter is documented in wp-includes/user.php */ |
| 2902 | $illegal_user_logins = (array) apply_filters( 'illegal_user_logins', array() ); |
| 2903 | if ( in_array( strtolower( $sanitized_user_login ), array_map( 'strtolower', $illegal_user_logins ), true ) ) { |
| 2904 | $errors->add( 'invalid_username', __( '<strong>Error</strong>: Sorry, that username is not allowed.' ) ); |
| 2905 | } |
| 2906 | } |
| 2907 | |
| 2908 | // Check the email address. |
| 2909 | if ( '' === $user_email ) { |
| 2910 | $errors->add( 'empty_email', __( '<strong>Error</strong>: Please type your email address.' ) ); |
| 2911 | } elseif ( ! is_email( $user_email ) ) { |