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未定義関数session_register（）の呼び出し

みんな助けてください!!

ログインできない理由、およびこのエラー：*致命的なエラー：C：\ xampp\htdocs **\proses1.phpの行27 *の未定義関数session_register（）を呼び出してください

このproses1.phpコード：

<?php
include "connect.php";
   $username= $_POST['username'];
   $password= $_POST['password'];

   if (!$_POST['username'] | !$_POST['password'])
 {
    print "<script>alert('isi username dan password anda!');
    javascript:history.go(-1);</script>";
    exit;
 }
 $username = stripslashes($username);
 $password = stripslashes($password);
 $username = mysql_real_escape_string($username);
 $password = mysql_real_escape_string($password);
 $sql="SELECT login.username, login.password, login.status FROM login WHERE        
 login.username='$username' AND login.password='$password'";
 $result=mysql_query($sql) or die(mysql_error());
 $count=mysql_num_rows($result);
 // If result matched $myusername and $mypassword, table row must be 1 row
 $r=mysql_fetch_array($result);

 session_start();
 session_register("username");
 session_register("password");
 session_register("status");
 //session_register("nojual");
 $_SESSION['username']=$r[username];
 $_SESSION['password']=$r[password];
 $_SESSION['status']=$r[status];
 //$_SESSION['nojual']=$r[nojual];
//$_SESSION['nojual']=$r[nojual];

       if ($_SESSION['status']=='dokter') // ini untuk admin
           {
           header("location:home_dokter.php");
       }else if($_SESSION['status']=='apotik'){
           header("location:uji.php");
       }else if($_SESSION['status']=='bagian persediaan'){
          header("location:obat.php");


      }else{
      print "<script>alert('anda salah login!');
    javascript:history.go(-1);</script>";
    exit;
   }
  ?>
phpmysqllogin
8
Alver

この関数はPHP 5.4ではなく

$_SESSION['myusername']="something";
22
chandresh_cool