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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 |
---|---|
1571 | } |
1572 |
|
1573 | /** |
1574 | * Filters the list of blacklisted usernames. |
1575 | * |
1576 | * @since 4.4.0 |
1577 | * |
1578 | * @param array $usernames Array of blacklisted usernames. |
1579 | */ |
1580 | $illegal_logins = (array) apply_filters( 'illegal_user_logins', array() ); |
1581 |
|
1582 | if ( in_array( strtolower( $user_login ), array_map( 'strtolower', $illegal_logins ) ) ) { |
1583 | return new WP_Error( 'invalid_username', __( 'Sorry, that username is not allowed.' ) ); |
1584 | } |
1585 |
|
1586 | /* |
1587 | * If a nicename is provided, remove unsafe user characters before using it. |
1588 | * Otherwise build a nicename from the user_login. |
1589 | */ |
Line | Code |
2491 | $errors->add( 'empty_username', __( '<strong>ERROR</strong>: Please enter a username.' ) ); |
2492 | } elseif ( ! validate_username( $user_login ) ) { |
2493 | $errors->add( 'invalid_username', __( '<strong>ERROR</strong>: This username is invalid because it uses illegal characters. Please enter a valid username.' ) ); |
2494 | $sanitized_user_login = ''; |
2495 | } elseif ( username_exists( $sanitized_user_login ) ) { |
2496 | $errors->add( 'username_exists', __( '<strong>ERROR</strong>: This username is already registered. Please choose another one.' ) ); |
2497 |
|
2498 | } else { |
2499 | /** This filter is documented in wp-includes/user.php */ |
2500 | $illegal_user_logins = (array) apply_filters( 'illegal_user_logins', array() ); |
2501 | if ( in_array( strtolower( $sanitized_user_login ), array_map( 'strtolower', $illegal_user_logins ) ) ) { |
2502 | $errors->add( 'invalid_username', __( '<strong>ERROR</strong>: Sorry, that username is not allowed.' ) ); |
2503 | } |
2504 | } |
2505 |
|
2506 | // Check the email address |
2507 | if ( $user_email == '' ) { |
2508 | $errors->add( 'empty_email', __( '<strong>ERROR</strong>: Please type your email address.' ) ); |
2509 | } elseif ( ! is_email( $user_email ) ) { |