ID: 46018
Updated by: [EMAIL PROTECTED]
Reported By: jimmycnw at gmail dot com
-Status: Open
+Status: Feedback
Bug Type: Performance problem
Operating System: Linux
PHP Version: 5.2.6
New Comment:
Exactly where do you get the idea that memory usage should be same as
the file size is?? Arrays just take more memory, that's not any bug..
Previous Comments:
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[2008-09-07 15:50:54] jimmycnw at gmail dot com
Execute SAVING part first, in separate script. Then execute LOADING in
another script. DO it separately, not in one script.
------------------------------------------------------------------------
[2008-09-07 15:31:07] jimmycnw at gmail dot com
Description:
------------
The code is attached. Try executing 'SAVING' first. It will create a
file 'temp.txt' approximately 450Kb in size. Then execute 'LOADING'. You
will see, that over 3.5Mb (!!) of memory used in unserialize() function,
while there are just 450Kb of data.
Is it a bug in PHP? Any suggestions on how to fix it?
(When I do the same with string, not array, everything works fine. The
problem appears only when I use nested arrays)
Reproduce code:
---------------
define ('FILENAME', 'temp.txt');
define ('SIZE', 10 * 1024);
// SAVING
$array = array ();
for ($i = 0; $i<SIZE; $i++)
$array[] = array (uniqid ($i) => array ());
$data = serialize ($array);
file_put_contents (FILENAME, $data);
// LOADING
$before = memory_get_usage ();
$array = unserialize (file_get_contents (FILENAME));
$after = memory_get_usage ();
echo 'Memory used: '.($after-$before).' bytes, while size of data:
'.strlen (serialize ($array));
Expected result:
----------------
Memory used should be around 450Kb, while I see 3.5Mb.
Actual result:
--------------
Memory used: 3.5Mb
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Edit this bug report at http://bugs.php.net/?id=46018&edit=1
