#18847 [Fbk->Opn]: Output buffering problem

ID: 18847 User updated by: ntpt@centrum.cz Reported By: ntpt@centrum.cz -Status: Feedback +Status: Open Bug Type: Output Control Operating System: RH 7.3 PHP Version: 4.1.2, 4.0.6, 4.2.2 New Comment: I try to increase memeory limit via php.ini from originally 8Mb to 16, 24 or even 32 and 64 MB.... and restart apache server (PHP compilled as apache module.....) I try to increase script execution time to 120 and 180 s. But i thing this was useless, because without output buffering, the script run fine and take aprox 10-15 s. My linux box have 96 Mb of memory +256 mb swap I add another 128 MB of memory, another 64 MB swap to my configuration and even cut it off the Internet conectivity so nobody use the server at the time of my test. This changes have absolutelly no effect at all. Still the SAME size of the output buffer is returned. workarounds of this problem, that I try to do : $ob_treshold=250000; //fill buffer with max 256 kb of data for($i=0;$i<$lines;$i++) // main content generator loop of the script { $data = pg_fetch_array($result,$i); display_recort($data); // this create html table filled with data from DB // workaround start if (ob_get_length() > $ob_treshold) // output buffer is biger then $ob_treshold { $buffer=$buffer.ob_get_contents(); ob_end_clean(); // discard output buffer and stop buffering ob_start(); // start a new buffer } // workaround end } fails too, fetching only the same size of the data (cca 1.5) to variable $buffer. The size of the fetchet data is always the same, changes that I describe above have no effect on fetched size.... Previous Comments: ------------------------------------------------------------------------ [2002-08-11 23:21:06] yohgaki@php.net You are exhausting memory mostly likely. Get rid of memory-limit or set it to large enough number. Output buffer may consume a lot of memory depends of how you are using it. ------------------------------------------------------------------------ [2002-08-11 15:54:23] ntpt@centrum.cz I get and compiled the latest PHP4.2.2 (wasnot so horrible thing as I affraid....) and tested for this bug. Laterst PHP 4.2.2 suffer this bug too....... It's behavior is exactly the same as described on 4.0.6 and 4.1.2..... ------------------------------------------------------------------------ [2002-08-10 18:24:18] ntpt@centrum.cz I have a script, that generate content (html page). When all page is generated, I need grab script output and do some processing on it. And then save it to file or/and output it to the browser.If the generated page is small, everything works fine. It fails because it fetch only a certain portion of data. Ie if some part of the script (that work without outputbuffering fine ), produce cca 3 MB big html page and then try to fetch content of the output buffer into the variable $data, it fetch only cca 1.5 Mb into. No error messages, crashes, segfaults etc..... Even script execution is not halted, because browser show correct (so correct as it can be without lost data....) results of future processing of $data done by the running script... I try to paly with php.ini, increasing script execution time, increasing memory usage limits atd, trying add some memory to my machine with absolutely no effect on that case.... 4.2.2 I do not try, I am affraid, that I will not be able succefuly build it and integrate with my distribution and with all the extensions I need to run in our production server... PS: Sory for my bad english... ------------------------------------------------------------------------ [2002-08-10 18:01:34] kalowsky@php.net Please be more specific on how it fails. Does it just end and nothing else happens? Have you tried increasing the max_execution_time value to something else? Have you tried a the PHP 4.2.2 release to see if this occurs there as well? ------------------------------------------------------------------------ [2002-08-10 17:54:08] ntpt@centrum.cz It seems that output buffering can not handle more , than aprox 1.5 Mb output. If i done something like: <? ob_start(); ... ... --generate some BIG output content, ie bightml page $data=ob_get_contents(); ?> $data can never got more then approx 1.5 mb of data. The rest of buffer is cut off and lost. It seems to be more general problem in output buffering, because I try to make some workaround of this (like using ob_get_length(),and if the length of the buffer exceeded some size then ob_get_content(), ob_end_clean(), ob_start()inside the content creation loop, hoping, that i put content of the buffer into the some variable, clean it and start again ovewrcome this limit ), but it fails. The same behavior have 4.0.6 too ------------------------------------------------------------------------ -- Edit this bug report at http://bugs.php.net/?id=18847&edit=1