#38285 [Opn->Bgs]: php.ini configuration to limit the maximum buffer size doesn't work.

ID: 38285 Updated by: mike@php.net Reported By: bref at instinctiv-e dot com -Status: Open +Status: Bogus Bug Type: Output Control Operating System: Linux 2.6.17 PHP Version: 5.1.4 New Comment: Thank you for taking the time to write to us, but this is not a bug. Please double-check the documentation available at http://www.php.net/manual/ and the instructions on how to report a bug at http://bugs.php.net/how-to-report.php http://php.net/ob_start INI output_buffering=NNNN starts its own output buffer Previous Comments: ------------------------------------------------------------------------ [2006-08-01 17:33:37] bref at instinctiv-e dot com Description: ------------ Output buffering doesn't respect the maximum limit as set in php.ini in php 5.1.4 plus some earlier versions. output_buffering=xxx In fact it is possible to go well past the limit and consume the entire memory allocated to the script by memory_limit causing the script to halt. snippet from php.ini - If you wish to limit the size of the buffer ; to a certain size - you can use a maximum number of bytes instead of 'On', as ; a value for this directive (e.g., output_buffering=4096). Reproduce code: --------------- ini_set("zlib.output_compression",0); ini_set("max_execution_time",5); // set this to larger than your output_buffering=xxx limit ini_set("memory_limit",'3M'); echo 'Maximum buffer size as set in php.ini output_buffering: ', $limit = ini_get("output_buffering"), '<br />'; echo '<br />','Starting OB test...','<br />'; ob_start(); // fill up the buffer 10 bytes beyond the supposed limit for($i=0;$i<($limit+10);$i++) { echo 'a'; } $size = ob_get_length(); ob_end_flush(); Expected result: ---------------- Expected the output buffer to respect the maximum bytes cap as set out in php.ini output_buffering=xxxx Actual result: -------------- The buffer keeps on growing past the set limit, until it fills the memory_limit or max_execution_time limits and terminates the script. ------------------------------------------------------------------------ -- Edit this bug report at http://bugs.php.net/?id=38285&edit=1