Ahmed-Elswerky

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<script> 
window.onload = setTimeout(function(){height11();},500);
document.getElementsByTagName("body")[0].onclick = function(){setTimeout(function(){height11();},300);}
function height11(){
        var body = document.body,
            html = document.documentElement;
        var height =  html.scrollHeight || html.offsetHeight ;
            document.getElementById("footer").style.top = height - 40 + "px";console.log(height);
    }

Ahmed-Elswerky

<?php
    ob_start();
    if(session_status() == PHP_SESSION_NONE)
        session_start();
    include 'mysqli.php';   
    function test_input($data) {
      $data = trim($data);
      $data = stripslashes($data);
      $data = htmlspecialchars($data);
      return $data;