PHP開發(fā) 小型論壇教程之登錄-2
創(chuàng)建 login.php 文件
本頁面就是將我們從登錄頁面?zhèn)鬟^來的數(shù)據(jù)跟數(shù)據(jù)庫里的數(shù)據(jù)進行比對
不正確的話不允許用戶登錄
具體代碼如下
<?php session_start(); header("Content-type:text/html;charset=utf-8"); $link = mysqli_connect('localhost','root','root','mybbs');//鏈接數(shù)據(jù)庫 mysqli_set_charset($link,'utf8'); //設(shè)定字符集 $username=$_POST['username']; $password=md5($_POST['password']); if($username==''){ echo "<script>alert('請輸入用戶名');location='" . $_SERVER['HTTP_REFERER'] . "'</script>"; exit; } if($password==''){ echo "<script>alert('請輸入密碼');location='" . $_SERVER['HTTP_REFERER'] . "'</script>"; exit; } $sql="select id,username,password from member where username= $username"; //從數(shù)據(jù)庫查詢信息 $que=mysqli_query($link,$sql); $row=mysqli_fetch_array($que); if($row){ if($password !=($row['password']) || $username !=$row['username']){ echo "<script>alert('密碼錯誤,請重新輸入');location='login.html'</script>"; exit; } else{ $_SESSION['username']=$row['username']; $_SESSION['id']=$row['id']; echo "<script>alert('登錄成功');location='index.php'</script>"; } }else{ echo "<script>alert('您輸入的用戶名不存在');location='login.html'</script>"; exit; }; ?>