我只是无法让我的变量转移到下一页。变量赋值在初始页面(已测试)上工作正常，但在转到下一个页面时该值变为 null。请帮忙!
第 1 页:
<?PHP session_start(); ?>
<HTML>
<HEAD>
<META NAME='robots' CONTENT='noindex,nofollow'>
<TITLE>Master Chief's Gamestore</TITLE>
<STYLE type="text/css">
BODY {
color: #ffffff;
background: url('~/halo-reach.jpg');
background-repeat: no-repeat;
background-position: top;
background-color: black;
}
</STYLE>
</HEAD>
<body vLink='#3366CC' link='#3366CC' alink='#3366CC'>
<br/><br/><br/><br/><br/>
<table width='100%' height='80%'>
<tr>
<td align='center' valign='middle'>
<table width="50%" cellspacing="0" cellpadding="25" border="0">
<form method="post">
<tr bgcolor="#666633">
<th id="header" align="left" colspan="3">
<DIV align="center">
<font face="Verdana, Arial, Helvetica" color="white" size="3">
Master Chief's Gamestore </font>
</DIV>
</th>
</tr>
<tr bgcolor="#A3A385">
<td width="100%" valign="middle" colspan="2">
<font face="Verdana, Arial, Helvetica" size="2">
<div align="center"><br/><br/>
Username: 
<input type="text" name="username"> 
Password: 
<input type="password" name="password"><br/>
<br/><input type="submit" name="act" value="Login"><br/>
<input type="submit" name="act" value="Register"><br/>
<input type="submit" name="act" value="Main"><br/> <br/><br/>
</div>
</font>
</td>
</tr>
<?PHP
if ($_POST['act'] == "Login") {
mysql_connect("~", "~", "~") or die("unable to connect to server");
mysql_select_db("~") or die("unable to select database");
$user = $_POST['username'];
$pass = $_POST['password'];
$query = "select * from users where user like '%" . $user . "%' and pass like '%" . $pass . "%';";
$result = mysql_query($query);
$rows = mysql_numrows($result);
if ($rows == 0 || strlen($user) == 0) {
echo "<br />Login Failure";
} else {
$_SESSION['user'] = mysql_result($result, 0, "user");
$_SESSION['id'] = mysql_result($result, 0, "P_Id");
header('Location: ~/success.php');
}
}
if ($_POST['act'] == "Register") {
header('Location: ~/register.php');
}
if ($_POST['act'] == "Main") {
header('Location: ~/index.php');
}
?>
<div align="center">
<tr bgcolor="#666633">
<td align="left">
Logged in as:
<?PHP
$user = $_SESSION['user'];
if (!$user) {
$user = 'Guest';
}
echo $user;
?>
</td>
<td align="right">
Password: 
<input type="password" name="srcpw">
<input type="submit" name="dspphp" value="Display PHP">
</td>
</tr>
</div>
</form>
</table>
</td>
</tr>
</table>
</body>
</html>
第 2 页:
<?PHP session_start(); ?>
<HTML>
<HEAD>
<META NAME='robots' CONTENT='noindex,nofollow'>
<TITLE>Master Chief's Gamestore</TITLE>
<STYLE type="text/css">
BODY {
color: #ffffff;
background: url('~/halo-reach.jpg');
background-repeat: no-repeat;
background-position: top;
background-color: black;
}
</STYLE>
</HEAD>
<body vLink='#3366CC' link='#3366CC' alink='#3366CC'>
<br/><br/><br/><br/><br/>
<table width='100%' height='80%'>
<tr>
<td align='center' valign='middle'>
<table width="30%" cellspacing="0" cellpadding="25" border="0">
<form method="post">
<tr bgcolor="#666633">
<th id="header" align="left" colspan="3">
<DIV align="center">
<font face="Verdana, Arial, Helvetica" color="white" size="3">
Master Chief's Gamestore </font>
</DIV>
</th>
</tr>
<tr bgcolor="#A3A385">
<td width="100%" valign="middle" colspan="2">
<font face="Verdana, Arial, Helvetica" size="2">
<div align="center">
<br/><br/>Success<br/><br/>
<input type='submit' name='main' value='Main'>
<?PHP
if ($_POST['main'] == "Main") {
header('Location: http://~/index.php');
}
if ($_POST['act'] == "Display Code") {
if ($_POST['pw'] == "pass") {
highlight_file("success.php");
}
}
?>
</div>
</font>
</td>
</tr>
<div align="center">
<tr bgcolor="#666633">
<td align="left">
Logged in as:
<?PHP
$user = $_SESSION['user'];
if (!$user)
$user = 'Guest';
echo $user;
?>
</td>
<td align="right">
Password: 
<input type="password" name="pw">
<input type="submit" name="dspphp" value="Display PHP">
</td>
</tr>
</div>
</form>
</table>
</td>
</tr>
</table>
</body>
</html>
编辑:我试过这个示例代码，但它不起作用。
第 1 页:
<?php
session_start();
if (isset($_GET['link'])) {
$_session['myvariable'] = 'Hello World';
header('Location: http://' . $_SERVER['SERVER_NAME'] . dirname($_SERVER['REQUEST_URI']) . '/page2.php');
exit;
}
?>
<a href="<?php print $_SERVER['REQUEST_URI'] . '?link=yes'; ?>">Click Here</a>
第 2 页:
<?php
session_start();
print 'Here is page two, and my session variable: ';
print $_session['myvariable'];
exit;
?>
但正如我在下面发布的那样，我已经在同一台服务器上成功地使用了其他页面中的 session 。太令人沮丧了....
顺便说一句，感谢所有帖子!
最佳答案
确保启用 cookie，以便第二页实际上重新创建第一页的 session ，而不是创建一个新的空 session 。查看http://www.php.net/manual/en/session.idpassing.php了解详情。
编辑
session 未按预期工作的另一个可能原因，特别是如果它只影响某些页面，是在您的第一个“session_start() 错误之前有意外的空白或其他输出
关于PHP session 不工作，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/5849898/