一开始,脚本运行正常。我登录,退出了,并且能够多次这样做。
现在,我不知道发生了什么。该页面最后为空白,如果它不是完全空白,则会显示一些HTML,但不会重定向。然而,它已经登录了我,因为我可以直接进入我应该通过在地址栏中输入而不被退回到登录页面的重定向到的页面(这是否有意义)?
我知道它必须是我的会话,但我不完全理解。
这是登录检查脚本:
<?php
$host=""; // Host name
$username=""; // Mysql username
$password=""; // Mysql password
$db_name=""; // Database name
$tbl_name=""; // Table name
mysql_connect("$host", "$username", "$password")or die("cannot connect");
mysql_select_db("$db_name")or die("cannot select DB");
$uname=$_POST['uname'];
$pname=$_POST['pname'];
$uname = stripslashes($uname);
$pname = stripslashes($pname);
$uname = mysql_real_escape_string($uname);
$pname = mysql_real_escape_string($pname);
$sql="SELECT * FROM $tbl_name WHERE username='$uname' and password='$pname'";
$result=mysql_query($sql);
$count=mysql_num_rows($result);
if($count==1){
session_register("uname");
session_register("pname");
header("location:index.php");
echo " '<h2>Continue to the donor list</h2><br /><br />
<div id="login-box-name">
Return to the login screen?
</div>
<div id="login-box-field">
</div>
<div id="login-box-name2"><a href="index.php"><img src="images/continue-btn.png" /></a></div>
<div id="login-box-field2">
</div>
<br />
<span class="login-box-options">
</span>
<br />
<br />' ";
}
else {
echo " '<h2>Wrong Username or Password</h2><br /><br />
<div id="login-box-name">
Return to the login screen?
</div>
<div id="login-box-field">
</div>
<div id="login-box-name2"><a href="login.php"><img src="images/return-btn.png" /></a></div>
<div id="login-box-field2">
</div>
<br />
<span class="login-box-options">
</span>
<br />
<br />' ";
}
?>
这些是我收到的错误:
[27-Nov-2011 17:52:59] PHP Warning: Cannot modify header information - headers already sent by (output started at /home4/folder/public_html/ccc/check.php:2) in /home4/folder/public_html/ccc/check.php on line 35
[27-Nov-2011 17:52:59] PHP Warning: Unknown: Your script possibly relies on a session side-effect which existed until PHP 4.2.3. Please be advised that the session extension does not consider global variables as a source of data, unless register_globals is enabled. You can disable this functionality and this warning by setting session.bug_compat_42 or session.bug_compat_warn to off, respectively in Unknown on line 0
答案 0 :(得分:2)
确保在php标记之前或之后没有任何代码回显。我学会避免这种情况的原因之一是删除最后的?>
标记,如果之后没有其他任何标记,或者页面是纯粹的PHP。这样做有助于避免在它之后产生任何可能导致错误的额外空格。
答案 1 :(得分:2)
如果在check.php页面中使用include或require,请不要在index.php页面或其他包含的页面中使用类似的标题。此外,请确保在打开和关闭PHP标记<?php . . . ?>
之前或之后没有任何空格。