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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 |
|---|---|
| 2113 | } |
| 2114 | |
| 2115 | /** |
| 2116 | * Filters the list of disallowed usernames. |
| 2117 | * |
| 2118 | * @since 4.4.0 |
| 2119 | * |
| 2120 | * @param array $usernames Array of disallowed usernames. |
| 2121 | */ |
| 2122 | $illegal_logins = (array) apply_filters( 'illegal_user_logins', array() ); |
| 2123 | |
| 2124 | if ( in_array( strtolower( $user_login ), array_map( 'strtolower', $illegal_logins ), true ) ) { |
| 2125 | return new WP_Error( 'invalid_username', __( 'Sorry, that username is not allowed.' ) ); |
| 2126 | } |
| 2127 | |
| 2128 | /* |
| 2129 | * If a nicename is provided, remove unsafe user characters before using it. |
| 2130 | * Otherwise build a nicename from the user_login. |
| 2131 | */ |
| Line | Code |
| 3322 | $errors->add( 'empty_username', __( '<strong>Error:</strong> Please enter a username.' ) ); |
| 3323 | } elseif ( ! validate_username( $user_login ) ) { |
| 3324 | $errors->add( 'invalid_username', __( '<strong>Error:</strong> This username is invalid because it uses illegal characters. Please enter a valid username.' ) ); |
| 3325 | $sanitized_user_login = ''; |
| 3326 | } elseif ( username_exists( $sanitized_user_login ) ) { |
| 3327 | $errors->add( 'username_exists', __( '<strong>Error:</strong> This username is already registered. Please choose another one.' ) ); |
| 3328 | |
| 3329 | } else { |
| 3330 | /** This filter is documented in wp-includes/user.php */ |
| 3331 | $illegal_user_logins = (array) apply_filters( 'illegal_user_logins', array() ); |
| 3332 | if ( in_array( strtolower( $sanitized_user_login ), array_map( 'strtolower', $illegal_user_logins ), true ) ) { |
| 3333 | $errors->add( 'invalid_username', __( '<strong>Error:</strong> Sorry, that username is not allowed.' ) ); |
| 3334 | } |
| 3335 | } |
| 3336 | |
| 3337 | // Check the email address. |
| 3338 | if ( '' === $user_email ) { |
| 3339 | $errors->add( 'empty_email', __( '<strong>Error:</strong> Please type your email address.' ) ); |
| 3340 | } elseif ( ! is_email( $user_email ) ) { |