Why can I not call my PHP script from HTML button? -

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i using button html script unset cookies, cannot make call php script through button click.

html script

<html xmlns="http://www.w3.org/1999/xhtml"> <head> <title>wcsst 2</title> <meta http-equiv="content-type" content="text/html; charset=utf-8" /> <style type='text/css'> </style> </head> <body>  <button style="color: black" <?php if(isset($_cookie["name"])) { ?> disabled <?php } ?> value='set cookie'><b>unset cookie</b></button>  <!-- end page source --> </body> </html>

php script

<?php  unset($_cookie['name']); unset($_cookie['age']);  header("location: cm.php"); exit(0); } ?>

how can make call php script through button click?

<html xmlns="http://www.w3.org/1999/xhtml"> <head> <title>wcsst 2</title> <meta http-equiv="content-type" content="text/html; charset=utf-8" /> <style type='text/css'> </style> </head> <body>         <?php if(isset($_cookie["name"])) { ?>         <button style="color: black" onclick="window.location.href='unset.php'"><b>unset cookie</b></button>         <?php }else{ ?>         <button style="color: black" onclick="window.location.href='set.php'"><b>set cookie</b></button>         <?php } ?> </body> </html>

unset.php script

<?php  unset($_cookie['name']); unset($_cookie['age']);  header("location: cm.php"); exit(0); } ?>

set.php script

<?php // set cookie ?>

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