header redirect function is not executing no errors are given

Question

i am trying to redirect the user when the login details are correct, but my header function is not running, I have tested the if statement without the header function by echo something out and this worked, so im not sure why the header is not being executed. any help would be appreciated.

login php

    <?php
session_start();
require '../includes/class/login.php';
$login = new login();
$username_error=' ';
$password_error=' ';
$result=' ';
if(isset($_POST['username']) && $_POST['username'] !== ""){
$username = $_POST['username'];
$username = trim($username);
$user_exists = $login->user_exists($username);
if ($user_exists) {
$username_error = 'correct username entered ';
} else {
$username_error = 'username not found';
  }
}

if(isset($_POST['password']) && $_POST['password'] !== ""){

$password = $_POST['password'];
$password = trim($password);
$password_check = $login->password_check($username,$password);
if ($password_check) {
$password_error = 'correct password entered ';
} else {
$password_error = 'password not found';
  }
}

if (isset($_POST['login'])&& $_POST['login'] !== "") { 
$log = $login->check_login($username,$password);

if ($log) {

 $login->redirect('home.php');

 //$user_session = 'welcome'.' '.$_SESSION['username'];

} else {
// Registration Failed
$password_error='Wrong username or password';
        }
    }

$return_data=array('username'=> $username_error, 'password'=> $password_error ,'user_session'=>$_SESSION['username']);

header('Content-Type: application/json');
echo json_encode($return_data);
exit();

?>

login in class

  public function redirect($url)
   {
       header("Location: $url");
   }

Possible duplicate of How to fix "Headers already sent" error in PHP — Qirel
– Qirel, Commented Oct 28, 2015 at 15:30

Angel Iliikov · Accepted Answer · 2015-10-28 15:22:42Z

1

You have some sort of output, which is causing "Headers already sent" error. You also have php errors disabled. Enable the errors and check it out (or check your apache error log).

answered Oct 28, 2015 at 15:22

Angel Iliikov

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6 Comments

Angel Iliikov Over a year ago

After your edit, are you sure there is no empty space before the opening php tag ? If there is one - this is your problem.

Qirel Over a year ago

To expand on the answer, you can have no kind of HTML, whitespace, tab, PHP echo prior to using header(). You most likely have it, you just need to find it. Check out How do I get PHP Errors to display?. And also possibly this duplicate: How to fix “Headers already sent” error in PHP

Qirel Over a year ago

Also, from that last link, what is your encoding set to? It should be UTF-8 without BOM

percy3872 Over a year ago

i have echo output before because i am using jquery to dynamically check the user input

Angel Iliikov Over a year ago

You can not have echo or any other output before the redirect. You must rethink your script / application logic.

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