ob_start(): Second array Member is not a Valid method

Question

We picked up today a system developed by Phpnuke. When analyzing, we saw that the version is old, but the client is irreducible in developing a new site, so we have to work on that existing one. The problem is that the server is giving the error HTTP ERROR 500. We open the log and the error that appears is:

ob_start(): Second array Member is not a Valid method

The code block is that way:

if (strstr($_SERVER['HTTP_ACCEPT_ENCODING'], 'gzip')) {
        if (extension_loaded('zlib')) {
            $do_gzip_compress = true;
            ob_start(array('ob_gzhandler',5)); // Essa é a linha
            ob_implicit_flush(0);
        //  if (ereg("MSIE", $_SERVER['HTTP_USER_AGENT'])) {
            if (preg_match("/MSIE/", $_SERVER['HTTP_USER_AGENT'])) {
                header('Content-Encoding: gzip');
            }
        }
    }

The PHP version is PHP Version 5.6.40. How can I fix this? Note that there is also a commented conditional, because this was the first error that appeared and made the adjustment.

Answer 1

what that function does eh compress the contents in gz to be sent to the customer.

Turns out this call is not correct:

ob_start(array('ob_gzhandler',5));

I believe that the original intention was to compact the contents with the compression level 5. A possible solution would be to call only the ob_gzhandler that the default value of the zlib will be used

ob_start('ob_gzhandler');

Or Voce arrow the desired compress level

ini_set('zlib.output_compression_level', 5);
ob_start('ob_gzhandler');

To avoid this kind of confusion in the future Oce can refactor the code, use better names and make it clearer what Oce is doing