I have created a simple validation routine in php and i'm wanting to make sure I am doing things efficiently....function reg_err_validation($reg_errors) {        global $woocommerce;        extract($_POST);        if($firstname == '' )        {            $reg_errors->add( 'registration-error', __( 'Please enter First Name.', 'woocommerce' ));        }           if($lastname == '' )        {            $reg_errors->add( 'registration-error', __( 'Please enter Last Name.', 'woocommerce' ));        }        if($phone == '' )        {            $reg_errors->add( 'registration-error', __( 'Please enter Phone.', 'woocommerce' ));        }        if($address1 == '' )        {            $reg_errors->add( 'registration-error', __( 'Please enter address.', 'woocommerce' ));        }        if($city == '' )                {            $reg_errors->add( 'registration-error', __( 'Please enter City.', 'woocommerce' ));        }        if($postcode == '' )                {            $reg_errors->add( 'registration-error', __( 'Please enter Postcode.', 'woocommerce' ));        }        return $reg_errors;}It all works correctly but would like to try and simplify it if possible.
Simple PHP Validation Routine
php;validation