PHP开发简单图书借阅系统完整登录实现代码
需要引入数据库文件config.php和公共文件head.php
<?php include("head.php");?> <?php include("config.php");?>
下面是完整的登录页面代码,文件名称为landing.php。
<?php include("config.php"); ?> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>简单图书借阅系统登录</title> <style> body,td,th {font-family: 微软雅黑;font-size: 9px;color: #222;} body {background-color: #FFFFFF;line-height:20px;} a:link {color: #222;text-decoration: none;} a:visited {text-decoration: none;color: #222;} a:hover {text-decoration: underline;color: #FF0000;} a:active {text-decoration: none;color: #999999;} </style> </head> <?php //初始化session if(isset($_GET['tj']) == 'out'){ session_destroy(); echo "<script language=javascript>alert('退出成功!');window.location='landing.php'</script>"; } if(isset($_POST['submit'])){ // 如果已经登录过,直接退出 if(isset($_SESSION['id'])) { //重定向到管理留言 echo "<script language=javascript>alert('您已登陆');window.location='index.php'</script>"; // 登录过的话,立即结束 exit; } // 获得参数 $nickname=$_POST['username']; $password=$_POST['password']; //$password=md5($password); // 检查帐号和密码是否正确, $sql="select * from user where name='$nickname' and password='$password'"; $re = mysqli_query($link,$sql); $result=mysqli_fetch_array($re); // 如果用户登录正确 if(!empty($result)) { //注册session变量,保存当前会话用户的昵称 $_SESSION['id']=$result['id']; // 登录成功重定向到管理页面 echo "<script language=javascript>alert('登陆成功');window.location='index.php'</script>"; } else { // 管理员登录失败 echo "<script language=javascript>alert('密码不正确');window.location='landing.php'</script>"; } } ?> <body> <?php include("head.php");?> <form name="myform" method="post" onSubmit="return CheckPost()" action="" style="margin-bottom:5px;"> <table width="782" border="0" align="center" cellpadding="5" cellspacing="1" bgcolor="#CCCCCC"> <tr> <td height="30" colspan="2" bgcolor="#FFFFFF">用户登录</td> </tr> <tr> <td width="337" align="right" bgcolor="#FFFFFF">用户名: </td> <td width="422" bgcolor="#FFFFFF"><input type="text" name="username"></td> </tr> <tr> <td align="right" bgcolor="#FFFFFF">密 码: </td> <td bgcolor="#FFFFFF"><input type="password" name="password"></td> </tr> <tr> <td align="right" bgcolor="#FFFFFF"><a href="reg.php">注册新用户</a> </td> <td bgcolor="#FFFFFF"><input type="submit" name="submit" value="登录"></td> </tr> </table> </form> </body> </html>