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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 |
|---|---|
| 2131 | } |
| 2132 | |
| 2133 | /** |
| 2134 | * Filters the list of disallowed usernames. |
| 2135 | * |
| 2136 | * @since 4.4.0 |
| 2137 | * |
| 2138 | * @param array $usernames Array of disallowed usernames. |
| 2139 | */ |
| 2140 | $illegal_logins = (array) apply_filters( 'illegal_user_logins', array() ); |
| 2141 | |
| 2142 | if ( in_array( strtolower( $user_login ), array_map( 'strtolower', $illegal_logins ), true ) ) { |
| 2143 | return new WP_Error( 'invalid_username', __( 'Sorry, that username is not allowed.' ) ); |
| 2144 | } |
| 2145 | |
| 2146 | /* |
| 2147 | * If a nicename is provided, remove unsafe user characters before using it. |
| 2148 | * Otherwise build a nicename from the user_login. |
| 2149 | */ |
| Line | Code |
| 3346 | if ( '' === $sanitized_user_login ) { |
| 3347 | $errors->add( 'empty_username', __( '<strong>Error:</strong> Please enter a username.' ) ); |
| 3348 | } elseif ( ! validate_username( $user_login ) ) { |
| 3349 | $errors->add( 'invalid_username', __( '<strong>Error:</strong> This username is invalid because it uses illegal characters. Please enter a valid username.' ) ); |
| 3350 | $sanitized_user_login = ''; |
| 3351 | } elseif ( username_exists( $sanitized_user_login ) ) { |
| 3352 | $errors->add( 'username_exists', __( '<strong>Error:</strong> This username is already registered. Please choose another one.' ) ); |
| 3353 | } else { |
| 3354 | /** This filter is documented in wp-includes/user.php */ |
| 3355 | $illegal_user_logins = (array) apply_filters( 'illegal_user_logins', array() ); |
| 3356 | if ( in_array( strtolower( $sanitized_user_login ), array_map( 'strtolower', $illegal_user_logins ), true ) ) { |
| 3357 | $errors->add( 'invalid_username', __( '<strong>Error:</strong> Sorry, that username is not allowed.' ) ); |
| 3358 | } |
| 3359 | } |
| 3360 | |
| 3361 | // Check the email address. |
| 3362 | if ( '' === $user_email ) { |
| 3363 | $errors->add( 'empty_email', __( '<strong>Error:</strong> Please type your email address.' ) ); |
| 3364 | } elseif ( ! is_email( $user_email ) ) { |