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Bug #34471 fread() allocates length bytes without releasing unneeded
Submitted: 2005-09-12 03:03 UTC Modified: 2005-09-12 03:21 UTC
Votes:3
Avg. Score:5.0 ± 0.0
Reproduced:3 of 3 (100.0%)
Same Version:1 (33.3%)
Same OS:1 (33.3%)
From: wojtek at wojjie dot com Assigned:
Status: Wont fix Package: Performance problem
PHP Version: 5.0.5 OS: Gentoo/Fedora
Private report: No CVE-ID: None
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 [2005-09-12 03:03 UTC] wojtek at wojjie dot com
Description:
------------
fread() seems to allocate length amount of memory for getting data from the connection, but does not release it till you do something to variable. If $dat did have data, and you did:

$dat=$dat.'';

It would then release any unused memory. 

Not sure if this is a bug, but I thought I would submit it incase.


Reproduce code:
---------------
<?php
$fp=fsockopen('udp://192.168.0.1', 27015, $errno, $errstr);
stream_set_blocking($fp, false);
$dat=fread($fp, 4096000);
fclose($fp);
$bmem=memory_get_usage();
echo strlen($dat)."\n";
unset($dat);
echo (memory_get_usage()-$bmem)."\n";

?>


Expected result:
----------------
Difference in memory usage should not be so huge as 4095896 bytes.



Actual result:
--------------
-4095896


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 [2005-09-12 03:21 UTC] wez@php.net
That's the way fread() works.
Use stream_get_contents() instead.
 
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