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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 ) ) { |