PHP, ?? ?? ?? ???? ??? ??? ?? ??
??? ????? ????? ??? ??????? ??????.
?? ??? ??? ??? ??? ??? ??? ? ????. ??? ??? ?? ??? ???? ????? ????? ? ???? ??? ? ????.
???? <input>?? ???? ???? ???.
??? ??? ID? ???? ??? ??? ?????. ?? ????? ?? ?? ???? ?????.
<?php
if(isset($_POST['submit'])){
// 如果已經(jīng)登錄過，直接退出
if(isset($_SESSION['id'])) {
//重定向到管理留言
echo "<script language=javascript>alert('您已登陸');window.location='index.php'</script>";
// 登錄過的話，立即結(jié)束
exit;
}
}
?>?? ??? ??? ??(??)? ?? ??? ????? ??? ??(??)? ??? ???? ? ?????.
POST ????? ???? SQL ?? ?? ??? ??? ????? ????? ?????.
<?php
$nickname=$_POST['username'];
$password=$_POST['password'];
//$password=md5($password);
// 檢查帳號和密碼是否正確,
$sql="SELECT * FROM user where name='$nickname' and password='$password'";
$re = mysqli_query($link,$sql);
$result=mysqli_fetch_array($re);
// 如果用戶登錄正確
if(!empty($result)) {
//注冊session變量，保存當前會話用戶的昵稱
$_SESSION['id']=$result['id'];
// 登錄成功重定向到管理頁面
echo "<script language=javascript>alert('登陸成功');window.location='index.php'</script>";
}
else {
// 管理員登錄失敗
echo "<script language=javascript>alert('密碼不正確');window.location='landing.php'</script>";
}
?>md5() ??? ??? ????? ? ?????.
