How to check for an Empty field in a Form?

Question

I have php script form which I used to input Members Details of my system into the MySQL database. My requirement is to display the last member's details in a input box.

Answer 1

You can check in two ways using php and javascript. If You want client side validation then you can use javascript or if you want server side validation then you can use php.
Using javascript-

if(document.formnm.fieldnm.value=='')
{
alert('your message');
return false;
}

Using php-

if($_REQUEST['fieldnm']=='') { echo "Your Message"; }