<?php 
 $input = array(2,20,60,90,100); 
 $exp = $input[array_rand($input,1)]; 
 $user['exp']=2; 
 $expX = round(100/($exp/$user['exp'])); 
 echo $exp; 
 ?> 
  
 <style type="text/css"> 
  .progress { 
   color:lime; 
   background: red; 
  } 
  .progress2 { 
   color:lime; 
   background: blue; 
  } 
 </style> 
  
  
  
 <div class='progress' style='width:<?=round(100/($exp/($user['exp'])));?>%'>-----></div> 
 or 
 <div class='progress2' style='width:<?php echo round(100/($exp/($user['exp'])));?>%'>-----></div> 
 or 
 <div class='progress' style='width:<?=$expX;?>%'>-----></div>