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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 |
---|---|
1439 | } |
1440 |
|
1441 | /** |
1442 | * Filters the list of blacklisted usernames. |
1443 | * |
1444 | * @since 4.4.0 |
1445 | * |
1446 | * @param array $usernames Array of blacklisted usernames. |
1447 | */ |
1448 | $illegal_logins = (array) apply_filters( 'illegal_user_logins', array() ); |
1449 |
|
1450 | if ( in_array( strtolower( $user_login ), array_map( 'strtolower', $illegal_logins ) ) ) { |
1451 | return new WP_Error( 'invalid_username', __( 'Sorry, that username is not allowed.' ) ); |
1452 | } |
1453 |
|
1454 | /* |
1455 | * If a nicename is provided, remove unsafe user characters before using it. |
1456 | * Otherwise build a nicename from the user_login. |
1457 | */ |
Line | Code |
2255 | $errors->add( 'empty_username', __( '<strong>ERROR</strong>: Please enter a username.' ) ); |
2256 | } elseif ( ! validate_username( $user_login ) ) { |
2257 | $errors->add( 'invalid_username', __( '<strong>ERROR</strong>: This username is invalid because it uses illegal characters. Please enter a valid username.' ) ); |
2258 | $sanitized_user_login = ''; |
2259 | } elseif ( username_exists( $sanitized_user_login ) ) { |
2260 | $errors->add( 'username_exists', __( '<strong>ERROR</strong>: This username is already registered. Please choose another one.' ) ); |
2261 |
|
2262 | } else { |
2263 | /** This filter is documented in wp-includes/user.php */ |
2264 | $illegal_user_logins = array_map( 'strtolower', (array) apply_filters( 'illegal_user_logins', array() ) ); |
2265 | if ( in_array( strtolower( $sanitized_user_login ), $illegal_user_logins ) ) { |
2266 | $errors->add( 'invalid_username', __( '<strong>ERROR</strong>: Sorry, that username is not allowed.' ) ); |
2267 | } |
2268 | } |
2269 |
|
2270 | // Check the email address |
2271 | if ( $user_email == '' ) { |
2272 | $errors->add( 'empty_email', __( '<strong>ERROR</strong>: Please type your email address.' ) ); |
2273 | } elseif ( ! is_email( $user_email ) ) { |