From: [EMAIL PROTECTED]
Operating system: Linux
PHP version: 4.4.1
PHP Bug Type: Performance problem
Bug description: preg_replace() doesn't release memory
Description:
------------
preg_replace() doesn't seem to release the memory used to do its
operation.
Simple example using preg_replace():
php -r 'var_dump(memory_get_usage()); $input = str_pad("", 50000, "foo");
var_dump(memory_get_usage()); $input = preg_replace(";foo;", "", $input);
var_dump(memory_get_usage());'
int(15216)
int(65320)
int(115352)
Simple example using ereg_replace():
php -r 'var_dump(memory_get_usage()); $input = str_pad("", 50000, "foo");
var_dump(memory_get_usage()); $input = ereg_replace("foo", "", $input);
var_dump(memory_get_usage());'
int(15208)
int(65312)
int(15312)
Maybe this is just a documentation issue, but than it should be noted. The
documentation says that preg_ is faster, which it is, and the documentation
somewhere mentiones a regex cache, but it doesn't say that the amount of
memory grows by the size of the input sring.
It's an interesting behaviour which should be considered when memory is an
issue.
--
Edit bug report at http://bugs.php.net/?id=35258&edit=1
--
Try a CVS snapshot (php4): http://bugs.php.net/fix.php?id=35258&r=trysnapshot4
Try a CVS snapshot (php5.0):
http://bugs.php.net/fix.php?id=35258&r=trysnapshot50
Try a CVS snapshot (php5.1):
http://bugs.php.net/fix.php?id=35258&r=trysnapshot51
Fixed in CVS: http://bugs.php.net/fix.php?id=35258&r=fixedcvs
Fixed in release: http://bugs.php.net/fix.php?id=35258&r=alreadyfixed
Need backtrace: http://bugs.php.net/fix.php?id=35258&r=needtrace
Need Reproduce Script: http://bugs.php.net/fix.php?id=35258&r=needscript
Try newer version: http://bugs.php.net/fix.php?id=35258&r=oldversion
Not developer issue: http://bugs.php.net/fix.php?id=35258&r=support
Expected behavior: http://bugs.php.net/fix.php?id=35258&r=notwrong
Not enough info:
http://bugs.php.net/fix.php?id=35258&r=notenoughinfo
Submitted twice:
http://bugs.php.net/fix.php?id=35258&r=submittedtwice
register_globals: http://bugs.php.net/fix.php?id=35258&r=globals
PHP 3 support discontinued: http://bugs.php.net/fix.php?id=35258&r=php3
Daylight Savings: http://bugs.php.net/fix.php?id=35258&r=dst
IIS Stability: http://bugs.php.net/fix.php?id=35258&r=isapi
Install GNU Sed: http://bugs.php.net/fix.php?id=35258&r=gnused
Floating point limitations: http://bugs.php.net/fix.php?id=35258&r=float
No Zend Extensions: http://bugs.php.net/fix.php?id=35258&r=nozend
MySQL Configuration Error: http://bugs.php.net/fix.php?id=35258&r=mysqlcfg
