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Premature ob_end_flush() before header modification...? #2298

tamasoz opened this issue May 5, 2019 · 0 comments


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commented May 5, 2019


I am by no means any good at PHP but I encountered the following issue using osclass 3.8 and the latest PaymentPro plugin...

The problem was there (line 1472 in utils.php):

function osc_redirect_to($url, $code = null) { if(ob_get_length()>0) { ob_end_flush(); } if($code!=null) { header("Location: ".$url, true, $code); } else { header("Location: ".$url); } exit; }

Then I noticed that when I update the PaymentPro plugin the response stalls...the logfile showed the following error:

PHP Warning: Cannot modify header information - headers already sent...
...and then the reference to the utils.php file.

As far as I understand this function closes a stream or flushing the stream of some sort then tries to modify the header...which is not possible after calling the ob_end_flush()...according to the doco..

As a solution I swaped the two calls around and it far anyway...
`function osc_redirect_to($url, $code = null) {

if($code!=null) {
    header("Location: ".$url, true, $code);
} else {
    header("Location: ".$url);

if(ob_get_length()>0) {


I am not sure if this is a real issue or just some localized mayhem here...but I thought I let you know....

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