PHP header forwarding not working
May 28th, 2009
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If you are finding that header() is not working for no obvious reason, make use of the headers_sent() function to drill down to the cause of the problem.
Consider the following scenario,
1 2 3 4 5 6 7 | <?php // Sign out signOut(); // Redirect back to the main page header("Location: http://mysite.com/mainpage"); ?> |
If for some reason, the header() call to redirect is not working, there won’t be any error messages, making it difficult to debug. However, using headers_sent(), you may easily find the source of the problem.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 | <?php // Sign out signOut(); /* * If headers were already sent for some reason, * the upcoming call to header() will not work... */ if(headers_sent($file, $line)){ // ... where were the mysterious headers sent from? echo "Headers were already sent in $file on line $line..."; } // Redirect back to the main page header("Location: http://mysite.com/mainpage"); ?> |
source (comment by jasper)