Header() is not redirecting PHP [closed]

问题

It's difficult to tell what is being asked here. This question is ambiguous, vague, incomplete, overly broad, or rhetorical and cannot be reasonably answered in its current form. For help clarifying this question so that it can be reopened, visit the help center.

Closed 7 years ago.

I am using following PHP code to check session. But if the session is not logged into then page is not redirect just show the black page.

My If condition is right ! it is hitting header function .. Here is my code:

if(
    !isset($_SESSION['SESS_MEMBER_ID']) 
    || (trim($_SESSION['SESS_MEMBER_ID']) == '') 
    AND !isset($fb_login)
) {
    header("location:login.php?msg=Please+Login+Again.");
}

Suggestions welcome!

HTTP/1.1 200 OK
Date: Wed, 10 Oct 2012 10:57:14 GMT
Server: Apache/2.2.15 (CentOS)
X-Powered-By: PHP/5.3.3
Connection: close
Transfer-Encoding: chunked
Content-Type: text/html; charset=UTF-8

回答1:

If you're using header("Location: "); after you've output content make sure you've put ob_start(); earlier in the script. ob_start(); buffers your script, so nothing is output until you either call ob_end(); or the end of the file is reached. Calling header("Location: "); after content has already been output to the browser can cause problems.

回答2:

Put ob_start(); in beginning of PHP file , it will helps,

<?php
    ob_start();
    /*
    Your code
    */
 ?>

回答3:

Make sure to put an exit; or die; after the command: and make the "Location" start with uppercase

if (!isset($_SESSION['SESS_MEMBER_ID']) || (trim($_SESSION['SESS_MEMBER_ID']) == '') AND !isset($fb_login)) {           
    header("Location:login.php?msg=Please+Login+Again.");
    exit;
}

回答4:

Make the L capital.

 header("Location: login.php?msg=Please+Login+Again.");
 exit(); // just a precaution

回答5:

Try formatting the header correctly:

header("Location: login.php?msg=Please+Login+Again.");

And of course make sure that you are not sending any output (either on purpose or by mistake) before the call.

回答6:

header("Location: login.php?msg=Please+Login+Again.");
exit();

回答7:

1) Be sure that you do not send anything before the header() function

2) Make "location" to "Location: "

回答8:

Adding to what others have said, are you sure that the cnditions are met to hit the header()

You could use empty() to clear up your code & Do some testing :

//Debug
unset($_SESSION['SESS_MEMBER_ID']);
unset($fb_login);

if(empty($_SESSION['SESS_MEMBER_ID']) && !isset($fb_login)) {
    exit(header("Location: login.php?msg=Please+Login+Again."));
}

回答9:

Try changing the AND for &&

if(!isset($_SESSION['SESS_MEMBER_ID']) || (trim($_SESSION['SESS_MEMBER_ID']) == '') && !isset($fb_login)
    ) {
        header("location:login.php?msg=Please+Login+Again.");
    }

来源：https://stackoverflow.com/questions/12817846/header-is-not-redirecting-php