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登录后第一次出现未定义的索引错误,同时重定向到同一页面,我该如何解决这个问题?
这里是我的代码:索引页面上未定义索引错误
代码
<?php
session_start();
$error = $_SESSION['error'];
$conn = mysql_connect("localhost", "root", "");
mysql_select_db("db_food", $conn);
$row = mysql_query("select * from tbl_temp order by id DESC", $conn);
$row = mysql_fetch_array($row);
$user = $row['user'];
$pass = $row['pass'];
?>
的网页代码提交表单后
<?php
session_start();
$username = $_POST['username'];
$password = $_POST['password'];
if($username =='' || $password == '') {
$error = "Username or Password cant' be empty......";
header("location: index.php");
} else {
$data = mysql_query("select * from tbl_user where username='$username' && password='$password'", $conn);
$num = mysql_num_rows($data);
if($num==1) {
$row = mysql_fetch_array($data);
$_SESSION['name'] = $row['name'];
$_SESSION['id'] = $row['id'];
$_SESSION['user'] = $row['username'];
exit;
} else {
$error= "Either Username or Password wrong!!!";
header("location: index.php");
}
}
$_SESSION['error'] = $error;
?>
我想显示的错误消息索引页面。第一
请阅读有关SQL注入,以及如何预防它们。如果您不了解基本的安全原则,请不要使用SQL。 –
在索引的第二行,用'$ error = isset($ _ SESSION ['error'])替换'$ error = $ _SESSION ['error'];'? $ _SESSION ['error']:null;' –
@still_learning说什么。并且不要再使用mysql_ *函数。 –