Javascript - How to find users screen size and resolution, Detect users screen size and screen resolution

How to find users screen size and resolution

Many people use different hardware/pc for accessing online applications. In this growing trend web application are presented for web users depending upon their screen size, By using the below coed you can find the screen size od the device used by the user.

 <?php
  if(isset($_COOKIE["deviceResolution"])) {
   $urScreenRes = $_COOKIE["deviceResolution"];
  } 
  //set cookie using Javascript to get screen width and height
  else {
  ?>
  <script language="javascript">
  checkScreenRes();
  function checkScreenRes() {
   var exdate=new Date(); 
   exdate.setDate(exdate.getDate() + 365); 
   var screenWidth = screen.width +"x"+ screen.height; 
   var c_value=screenWidth + "; expires="+exdate.toUTCString(); 
   document.cookie= 'deviceResolution=' + c_value; 
  }
  </script>
<?php
  }
  echo "Your screen resolution is ". $urScreenRes;
?>

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