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我想有一个登录脚本伯特我有这个错误 未定义的变量：_session 看到页面下方PHP登录脚本未定义的变量：_session脚本
//checklogin.php
<?php
ob_start();
$host="localhost"; // Host name
$username="xxxxx"; // Mysql username
$password="xxxx"; // Mysql password
$db_name="test"; // Database name
$tbl_name="members"; // Table name
// Connect to server and select databse.
mysql_connect("$host", "$username", "$password")or die("cannot connect");
mysql_select_db("$db_name")or die("cannot select DB");
// Define $myusername and $mypassword
$myusername=$_POST['myusername'];
$mypassword=$_POST['mypassword'];
// To protect MySQL injection (more detail about MySQL injection)
$myusername = stripslashes($myusername);
$mypassword = stripslashes($mypassword);
$myusername = mysql_real_escape_string($myusername);
$mypassword = mysql_real_escape_string($mypassword);
$sql="SELECT * FROM $tbl_name WHERE username='$myusername' and password='$mypassword'";
$result=mysql_query($sql);
// Mysql_num_row is counting table row
$count=mysql_num_rows($result);
// If result matched $myusername and $mypassword, table row must be 1 row
if($count==1){
// Register $myusername, $mypassword and redirect to file "login_success.php"
$_session['name']= myusername;
$_session['pass']= mypassword;
header("location:login_success.php");
}
else {
echo "Wrong Username or Password";
}
ob_end_flush();
?>
//login_success.php
// Check if session is not registered, redirect back to main page.
// Put this code in first line of web page.
<?php
session_start();
if(!$_session['name']= myusername){
header("location:main_login.php");
}
?>
<html>
<body>
Login Successful
</body>
</html>
你需要capitlize它 - 这是'$ _SESSION' – andrewsi
也'如果（！ $ _session ['name'] = myusername）'应该是'if（$ _ session ['name']！= myusername）' – nana