if($connection){

$username = "admin";
$password = "admin";

$statement = mysqli_prepare($connection,"SELECT * FROM  `admin` WHERE username = ? AND password = ?");

mysqli_stmt_bind_param($statement,"ss",$username,$password);
mysqli_stmt_execute($statement);

if(mysqli_affected_rows($connection) == 1){
    $response = array('response'=>true);
}else{
    $response = array('response'=>false);
}

echo json_encode($response);

mysqli_stmt_close($statement);
mysqli_close($connection);     }