php - header() method doesn't work -

i want make redirect doesn't come back. know before header() method shouldn't call output result don't know have written methods returns output. source:

<?php include 'database.php';  $message =  mysqli_real_escape_string($con, $_post['message']);  date_default_timezone_set('iran'); $time = date('h:i:s a',time());  if(!isset($message) || $message == ''){     $error = "fill textbox"; 

  header("location: harf.php?error=".urlencode($error));//changed 

    exit(); } else {      $query = "insert main (user,message,time) values('robot','$message','$time')";      if (!mysqli_query($con,$query)) { 

      die('error: '.mysqli_error($con));//changed 

    } else {         header("location: harf.php");         exit();     } }?> 

thanks

you have spelling mistake here

header("locaton: harf.php?error=".urlencode($error)); 

change this

header("location: harf.php?error=".urlencode($error));