Calling a particular PHP function on form submit

Question

I was trying to call a particular php function in submit of a form both the form and php scripts are in same page. My code is below.(it is not working and so I need help)

Answer 1

you don't need this code

Instead, you can check whether the form is submitted by checking the post variables using isset.

here goes the code

if(isset($_POST)){
echo "hello ".$_POST['studentname'];
}

click here for the php manual for isset