ID: 35258
Updated by: [EMAIL PROTECTED]
Reported By: [EMAIL PROTECTED]
-Status: Feedback
+Status: Bogus
Bug Type: PCRE related
Operating System: Linux
PHP Version: 4.4.1
New Comment:
Memory usage doesn't depend on the length of the data.
Try this code:
<?php
var_dump(memory_get_usage());
$input = str_pad("", 50000, "foo");
var_dump(memory_get_usage());
$input = preg_replace(";foo;", "", $input);
unset($input); // <------------ !!
var_dump(memory_get_usage());
?>
Previous Comments:
------------------------------------------------------------------------
[2005-11-17 13:55:54] [EMAIL PROTECTED]
Please try using this CVS snapshot:
http://snaps.php.net/php5-latest.tar.gz
For Windows:
http://snaps.php.net/win32/php5-win32-latest.zip
------------------------------------------------------------------------
[2005-11-17 12:22:25] [EMAIL PROTECTED]
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 this bug report at http://bugs.php.net/?id=35258&edit=1
