Header Redirect doesn't work when i try to redirect to file outside of the same directory where the file with code is located. The code is under iar-calculator.php file the code works for second elseif but since the others two files are in different directory or folder. i tried using ../folder name/page.php,`folder name/page.php``. both doesnt work in my case.  How can i fix it? Thanks
//Redirection
if(isset($_POST['cmd_submit'])){
    if(($_POST['tire'] == "rear") && ($_POST['tractor'] == "2wd" || $_POST['tractor'] == "4wd")){
         //redirect here
         header('location:iar-calculator.php');
    }
    elseif(($_POST['tire'] == "rear") && ($_POST['tractor'] == "mfwd")){
         //redirect here
         header('location:index.php');
    }
    elseif(($_POST['tire'] == "front") && ($_POST['tractor'] == "2wd" || $_POST['tractor'] == "4wd")){
         //redirect here
         header('location:front/index.php');}
     elseif(($_POST['tire'] == "front") && ($_POST['tractor'] == "mfwd")){
         //redirect here
         header('location:front/iar-calc-rear.php');
    }
    else{
    }
}
//HTML code
    <form method="post" style="padding: 10px 0px 10px 5px;">
     <select name="tire" style="width:100px;display:inline;height: 30px;" class="first">
      <option  value="">Select</option>
      <option  value="rear">Rear Tire</option>
      <option  value="front">Front Tire</option>
  </select> 
  <select name="tractor" style="width:100px;height: 30px;display:inline" class="second" disabled>
      <option value="">select Type</option>
      <option value="2wd">2WD</option>
      <option value="mfwd">MFWD</option>
      <option value="4wd">4WD</option>
 </select>  
 <input type="submit" value="Go" name="cmd_submit" />
?>
 
    