Calling a function

Hi, I have a function xyz() in php code. When a button is clicked it should execute that particular function for that i have written as

<form action="<?=$_SERVER['PHP_SELF'];?>" method="post">
             <input type="button" name="submit" value="Submit"/>
</form>
<?php
if(isset($_POST['Submit'])) {
xyz();
}
?>

and then my function
function xyz()
{
}

but this is not working

can u tell me the solution asap.. Thanks in advance

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