php編寫用戶登陸和登出代碼
我看這里php的東東好象不是很多，所以貼一個(gè)自己用php寫的用戶登陸和登出代碼，數(shù)據(jù)庫(kù)是SQLserver
<?
if(isset($_GET[‘username‘]))
{
session_start();
$errormsg = "";
$input[‘username‘] = strtolower(trim($_GET[‘username‘]));
if($errormsg == "")
{
include("db_link.php");//你自己SQL數(shù)據(jù)庫(kù)所在路徑
$sql = "select
user_id,
username,
status
from guestbook
where username = ‘".$input[‘username‘]."‘ and status = 1";
$result = mysql_query($sql, $link) or die(‘Query database failed‘);
$num = mysql_num_rows($result);
if($num < 1)
{
$errormsg = "用戶名不正確，請(qǐng)重新登錄！";
}
else
{
$row = mysql_fetch_array($result);
if($row[‘username‘] == $input[‘username‘])
{
$_SESSION[‘s_user_id‘] = $row[‘user_id‘];
$_SESSION[‘s_username‘] = $row[‘username‘];
$_SESSION[‘s_status‘] = $row[‘status‘];
$_SESSION[‘time_last_load‘] = time();
?>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>管理員登錄</title>
<style>
button,input{font-size:12px;padding-top:2px;font-family : Arial, Helvetica, sans-serif;}
a:link:{color:#666666;}
a:visited:{color:#666666;}
a:hover:{color:#000000}
</style>
</head>
<body style="font-size: 12px;">
<table width="280" border="0" cellspacing="0" cellpadding="0" align="center" style="font-size: 12px;border:1px solid #639ECE;">
<tr><td height="10"></td></tr>
<tr><td height="40" align="center">登錄成功！</td></tr>
<tr><td height="10"></td></tr>
<tr><td height="22" align="right" bgcolor="#EFFBFF"><a href="javascript:void(null);" onclick="window.close();">關(guān)閉窗口</a> </td></tr>
</table>
</body>
</html>
<?
}
else
{
$errormsg = "用戶名不正確，請(qǐng)重新登錄！";
}
}
}
if($errormsg <> "")
{
?>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>管理員登錄</title>
<style>
button,input{font-size:12px;padding-top:2px;}
</style>
</head>
<body style="font-size: 12px;">
<table width="280" border="0" cellspacing="0" cellpadding="5" align="center" style="font-size: 12px;border:1px solid #639ECE;">
<tr><td height="10" colspan="2"></td></tr>
<form action="userlogin.php">
<tr>
<td width="60" align="right">用戶名：</td>
<td width="220"><input type="text" name="username" value="<?=$input[‘username‘]?>"></td>
</tr>
<tr>
<td></td>
<td align="center"> <input type="submit" value=" 登錄 "></td>
</tr>
</form>
<tr>
<td height="10" colspan="2"></td>
</tr>
<tr>
<td height="22" colspan="2" bgcolor="#EFFBFF"><?=$errormsg?></td>
</tr>
</table>
</body>
</html>
<?
}
}
else
{
?>
<!--登錄頁(yè)面-->
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>管理員登錄</title>
<style>
button,input{
font-size:12px;
padding-top:2px;
}
</style>
</head>
<body>
<table width="280" border="0" cellspacing="0" cellpadding="5" align="center" style="font-size: 12px;border:1px solid #639ECE;">
<tr><td height="10" colspan="2"></td></tr>
<form action="userlogin.php">
<tr>
<td width="60" align="right">用戶名：</td>
<td width="220"><input type="text" name="username"></td>
</tr>
<tr>
<td></td>
<td align="center"> <input type="submit" value=" 登錄 "></td>
</tr>
</form>
<tr><td height="10" colspan="2"></td></tr>
</table>
</body>
</html>
<?
}
?>
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要用這段代碼的話，可以新建一個(gè)名為userlogin的php文件，然后把以上內(nèi)容全部拷進(jìn)去，保存一下就可以了！
我是用session記錄的！
登出代碼（如下），也只需新建一個(gè)名為userlogout的php文件，然后拷進(jìn)全部?jī)?nèi)容，保存。
<?
session_start();
if(isset($_SESSION[‘s_user_id‘]))
{
session_unregister(‘s_user_id‘);
}
if(isset($_SESSION[‘s_username‘]))
{
session_unregister(‘s_username‘);
}
if(isset($_SESSION[‘s_status‘]))
{
session_unregister(‘s_status‘);
}
if(isset($_SESSION[‘time_last_load‘]))
{
session_unregister(‘time_last_load‘);
}
session_destroy;
header("Location:index.php");//你想登出后用戶返回的頁(yè)面
exit;
?> |
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