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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 |
|---|---|
| 1595 | } |
| 1596 | |
| 1597 | /** |
| 1598 | * Filters the list of disallowed usernames. |
| 1599 | * |
| 1600 | * @since 4.4.0 |
| 1601 | * |
| 1602 | * @param array $usernames Array of disallowed usernames. |
| 1603 | */ |
| 1604 | $illegal_logins = (array) apply_filters( 'illegal_user_logins', array() ); |
| 1605 | |
| 1606 | if ( in_array( strtolower( $user_login ), array_map( 'strtolower', $illegal_logins ), true ) ) { |
| 1607 | return new WP_Error( 'invalid_username', __( 'Sorry, that username is not allowed.' ) ); |
| 1608 | } |
| 1609 | |
| 1610 | /* |
| 1611 | * If a nicename is provided, remove unsafe user characters before using it. |
| 1612 | * Otherwise build a nicename from the user_login. |
| 1613 | */ |
| Line | Code |
| 2517 | $errors->add( 'empty_username', __( '<strong>Error</strong>: Please enter a username.' ) ); |
| 2518 | } elseif ( ! validate_username( $user_login ) ) { |
| 2519 | $errors->add( 'invalid_username', __( '<strong>Error</strong>: This username is invalid because it uses illegal characters. Please enter a valid username.' ) ); |
| 2520 | $sanitized_user_login = ''; |
| 2521 | } elseif ( username_exists( $sanitized_user_login ) ) { |
| 2522 | $errors->add( 'username_exists', __( '<strong>Error</strong>: This username is already registered. Please choose another one.' ) ); |
| 2523 | |
| 2524 | } else { |
| 2525 | /** This filter is documented in wp-includes/user.php */ |
| 2526 | $illegal_user_logins = (array) apply_filters( 'illegal_user_logins', array() ); |
| 2527 | if ( in_array( strtolower( $sanitized_user_login ), array_map( 'strtolower', $illegal_user_logins ), true ) ) { |
| 2528 | $errors->add( 'invalid_username', __( '<strong>Error</strong>: Sorry, that username is not allowed.' ) ); |
| 2529 | } |
| 2530 | } |
| 2531 | |
| 2532 | // Check the email address. |
| 2533 | if ( '' === $user_email ) { |
| 2534 | $errors->add( 'empty_email', __( '<strong>Error</strong>: Please type your email address.' ) ); |
| 2535 | } elseif ( ! is_email( $user_email ) ) { |