php - Login Script Difficulties? -

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i'm hoping can me login script. code works when run wamp localhost when goes live on server returns blank page when try , login can tell me why? code follows. 

<?php session_start();  //login script if(isset($_request['ch']) && $_request['ch'] == 'login'){  //give login credentials here if($_request['uname'] == 'zipbuzz' && $_request['pass'] == 'sewilt') $_session['login_user'] = 1; else $_session['login_msg'] = 1; }  //get page name redirect if(isset($_request['pagename'])) $pagename = $_request['pagename'];  //logout script if(isset($_request['ch']) && $_request['ch'] == 'logout'){ unset($_session['login_user']); header('location:login.php'); } if(isset($_session['login_user'])){ if(isset($_request['pagename'])) header('location:'.$pagename.'.php'); else header('location:admin.php'); }else{ ?>   <?php //display error msg if login credentials wrong! if(isset($_session['login_msg'])){ echo 'wrong username , password !'; unset($_session['login_msg']); } ?>

then add following pages need login access. 

<?php session_start(); //check logged in or not! if(!isset($_session['login_user'])){ header('location:login.php?pagename='.basename($_server['php_self'], ".php")); } ?>

first up, here's corrected version of code posted.

<?php session_start(); //login script if(isset($_request['ch']) && $_request['ch'] == 'login') {     //give login credentials here     if($_request['uname'] == 'zipbuzz' && $_request['pass'] == 'sewilt')         $_session['login_user'] = 1;     else         $_session['login_msg'] = 1; }  //get page name redirect if(isset($_request['pagename']))     $pagename = $_request['pagename'];  //logout script if(isset($_request['ch']) && $_request['ch'] == 'logout') {     unset($_session['login_user']);     header('location:login.php'); } if(isset($_session['login_user'])) {     if(isset($_request['pagename']))         header('location:'.$pagename.'.php');     else         header('location:admin.php'); } else {     //display error msg if login credentials wrong!     if(isset($_session['login_msg']))     {         echo 'wrong username , password !';         unset($_session['login_msg']);     } } ?>

besides that, there several lines use session_write_close(); make sure session data and/or status indeed saved/updated before redirect url. didn't implement in above correction though. take training opportunity. ;)


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