illegal_user_logins

apply_filters('illegal_user_logins') is found 5 times:

• /wp-admin/includes/user.php line 199

  		$errors->add( 'user_login', __( '<strong>Error:</strong> This username is already registered. Please choose another one.' ) );
  	}
  
  	/** This filter is documented in wp-includes/user.php */
  	$illegal_logins = (array) apply_filters( 'illegal_user_logins', array() );
  
  	if ( in_array( strtolower( $user->user_login ), array_map( 'strtolower', $illegal_logins ), true ) ) {
  		$errors->add( 'invalid_username', __( '<strong>Error:</strong> Sorry, that username is not allowed.' ) );
  	}
  
  	// Checking email address.
  

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• /wp-includes/ms-functions.php line 486

  		$errors->add( 'user_name', __( 'Sorry, that username is not allowed.' ) );
  	}
  
  	/** This filter is documented in wp-includes/user.php */
  	$illegal_logins = (array) apply_filters( 'illegal_user_logins', array() );
  
  	if ( in_array( strtolower( $user_name ), array_map( 'strtolower', $illegal_logins ), true ) ) {
  		$errors->add( 'user_name', __( 'Sorry, that username is not allowed.' ) );
  	}
  
  	if ( ! is_email( $user_email ) ) {
  

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• /wp-includes/rest-api/endpoints/class-wp-rest-users-controller.php line 1278

  			);
  		}
  
  		/** This filter is documented in wp-includes/user.php */
  		$illegal_logins = (array) apply_filters( 'illegal_user_logins', array() );
  
  		if ( in_array( strtolower( $username ), array_map( 'strtolower', $illegal_logins ), true ) ) {
  			return new WP_Error(
  				'rest_user_invalid_username',
  				__( 'Sorry, that username is not allowed.' ),
  				array( 'status' => 400 )
  

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• /wp-includes/user.php line 2144

  	 * @since 4.4.0
  	 *
  	 * @param array $usernames Array of disallowed usernames.
  	 */
  	$illegal_logins = (array) apply_filters( 'illegal_user_logins', array() );
  
  	if ( in_array( strtolower( $user_login ), array_map( 'strtolower', $illegal_logins ), true ) ) {
  		return new WP_Error( 'invalid_username', __( 'Sorry, that username is not allowed.' ) );
  	}
  
  	/*
  

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• /wp-includes/user.php line 3359

  	} elseif ( username_exists( $sanitized_user_login ) ) {
  		$errors->add( 'username_exists', __( '<strong>Error:</strong> This username is already registered. Please choose another one.' ) );
  	} else {
  		/** This filter is documented in wp-includes/user.php */
  		$illegal_user_logins = (array) apply_filters( 'illegal_user_logins', array() );
  		if ( in_array( strtolower( $sanitized_user_login ), array_map( 'strtolower', $illegal_user_logins ), true ) ) {
  			$errors->add( 'invalid_username', __( '<strong>Error:</strong> Sorry, that username is not allowed.' ) );
  		}
  	}
  
  	// Check the email address.
  

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