Update your sucker.php file to verify that the user did not leave any fields blank when submitting the form. You can check whether a particular parameter has been passed using the PHP function isset.

However, isset$($$$\_$REQUEST$["$name$"])$ will only check if the $$\_$REQUEST associative array has "name" as one of its keys; it does not check to see if the value of $$\_$REQUEST$["$name$"]$ is a non$-$empty value. Remember that $$\_$REQUEST$["$name$"]=""$ would give a falsey value and $$\_$REQUEST$["$name$"]=$ "abc" would give a truthy value.

If the user has not filled in every field, show an error message like the one below instead of displaying their submitted data: