cross-origin request blocked with extra header - php

Question

I am creating a apps with sql stuffs and i am using a online database, everything works fine if i input this header("Access-Control-Allow-Origin: *");
But the next few lines i need this header as well header('Content-Type', 'text/plain');
Once i insert that and run my html and to run this particular php file, i will get this error
error:
Cross-Origin Request Blocked: The Same Origin Policy disallows reading the remote resource at http://www.gamestopica.net/andrew/login.php. This can be fixed by moving the resource to the same domain or enabling CORS.
anyone know what i should do to fit those 2 header under the same php file without the cross-origin error?
my php file
<?php
header("Access-Control-Allow-Origin: *");
include_once('db.php');
session_start();
header('Content-Type', 'text/plain');
$username = $_POST['username'];
$password = $_POST['password'];
$verify = 0;
$result = $db->query("SELECT * FROM `userdetails` WHERE `username` = '".$username."'")
or die("fail");
if(mysqli_num_rows($result)>0)
{
$row = mysqli_fetch_array($result);
$passwordDB = $row["Password"];
if($password == $passwordDB)
{
$_SESSION['user'] = $username;
$result2 = json_encode(
array("type"=>"true", "username"=>$_SESSION['user'])
);
echo $result2;
}
else
{
$result2 = json_encode(
array("type"=>"false")
);
echo $result2;
}
}
else
{
$result2 = json_encode(
array("type"=>"nothing")
);
echo $result2;
}
?>

Answer 1

Your call to header() is not valid syntax for that function. Try changing:
header('Content-Type', 'text/plain');
to
header('Content-Type: text/plain');
and see if that fixes your issue.