mysql - How to grant access to certain users using PHP -

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i having issue php, trying write program redirect user previous page (membersonly.php). here code isn't working me.

$sess = $_session['sess_username'];  if ($sess == "admin") {     return; } else {      header("location: membersonly.php"); }

my attempt allow user "admin" admin.php page. code first thing run. $_session['sess_username'] variable assigned in login.php following code:

session_start(); $_session['sess_username'] = $_post['user']; header("location: membersonly.php");

now know correctly setting session username, because in page choose, can use echo $_session['sess_username']; , displays username. not sure doing wrong when try send user membersonly.php if username not admin. when try go page, denies access user, including admin.

[edit: solved] forgot add session_start(); @ top of page.

danbopes right, "returning" empty page. can this. note code not work unless username "admin" saved in session.

$sess = $_session['sess_username'];  if($sess !== 'admin'){     header("location: membersonly.php");     exit(); }  //admin content

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