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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 |
|---|---|
| 1817 | } |
| 1818 | |
| 1819 | /** |
| 1820 | * Filters the list of disallowed usernames. |
| 1821 | * |
| 1822 | * @since 4.4.0 |
| 1823 | * |
| 1824 | * @param array $usernames Array of disallowed usernames. |
| 1825 | */ |
| 1826 | $illegal_logins = (array) apply_filters( 'illegal_user_logins', array() ); |
| 1827 | |
| 1828 | if ( in_array( strtolower( $user_login ), array_map( 'strtolower', $illegal_logins ), true ) ) { |
| 1829 | return new WP_Error( 'invalid_username', __( 'Sorry, that username is not allowed.' ) ); |
| 1830 | } |
| 1831 | |
| 1832 | /* |
| 1833 | * If a nicename is provided, remove unsafe user characters before using it. |
| 1834 | * Otherwise build a nicename from the user_login. |
| 1835 | */ |
| Line | Code |
| 2925 | $errors->add( 'empty_username', __( '<strong>Error</strong>: Please enter a username.' ) ); |
| 2926 | } elseif ( ! validate_username( $user_login ) ) { |
| 2927 | $errors->add( 'invalid_username', __( '<strong>Error</strong>: This username is invalid because it uses illegal characters. Please enter a valid username.' ) ); |
| 2928 | $sanitized_user_login = ''; |
| 2929 | } elseif ( username_exists( $sanitized_user_login ) ) { |
| 2930 | $errors->add( 'username_exists', __( '<strong>Error</strong>: This username is already registered. Please choose another one.' ) ); |
| 2931 | |
| 2932 | } else { |
| 2933 | /** This filter is documented in wp-includes/user.php */ |
| 2934 | $illegal_user_logins = (array) apply_filters( 'illegal_user_logins', array() ); |
| 2935 | if ( in_array( strtolower( $sanitized_user_login ), array_map( 'strtolower', $illegal_user_logins ), true ) ) { |
| 2936 | $errors->add( 'invalid_username', __( '<strong>Error</strong>: Sorry, that username is not allowed.' ) ); |
| 2937 | } |
| 2938 | } |
| 2939 | |
| 2940 | // Check the email address. |
| 2941 | if ( '' === $user_email ) { |
| 2942 | $errors->add( 'empty_email', __( '<strong>Error</strong>: Please type your email address.' ) ); |
| 2943 | } elseif ( ! is_email( $user_email ) ) { |