ID: 38604
Comment by: no_spam_please at obmud dot com
Reported By: apachephp at gmail dot com
Status: Open
Bug Type: SimpleXML related
Operating System: Linux
PHP Version: 5.1.5
New Comment:
Hi folks:
Bug report # 34112, which apparently addresses the same
issue, ends with a note from a PHP developer that this is
not a "bug."
Bug or not, this is a problem and -- in my opinion -- should
be resolved if object-oriented PHP is intended to be used,
among other things, a CLI language.
As one of the commenters points out, the memory depletion
appears to stem from using an object inside a foreach.
By the way, the following hack fixes the above code, which
otherwise exhausts the allowed memory size in a split
second.
Yours truly,
Hakan
<?php
$xml = '<root><node></node></root>';
$xmldata = simplexml_load_string($xml);
while (true) {
$foo = $xmldata->node;
foreach ($foo as $node)
{
}
}
?>
Previous Comments:
------------------------------------------------------------------------
[2006-09-21 16:05:16] scope at planetavent dot de
Hi!
A shorter version that quickly eats up all the memory:
<?php
$xml = '<root><node></node></root>';
$xmldata = simplexml_load_string( $xml );
while( true )
{
foreach ( $xmldata->node as $node )
{
}
}
?>
(php5.1.5, WinXP, Shell)
Also tried the latest snapshot, same effect.
------------------------------------------------------------------------
[2006-09-19 09:26:17] rolfdw at gmail dot com
I dont know if this will help anyone but I found that it is the foreach
that actually causes the memory leak. If you replace the FOREACH with a
FOR loop it seems to be stable.
------------------------------------------------------------------------
[2006-08-28 09:48:31] apachephp at gmail dot com
script:
<?php
$XML='<TAG1>
<TAG2>
<TAG3>6809586b1c38100f</TAG3>
<TAG4>4323ac020</TAG4>
<TAG5>NULL</TAG5>
<TAG6>4323ac04e</TAG6>
<TAG7>ihttp://www.mysqlperformanceblog.com/</TAG7>
<TAG8>Who AM I</TAG8>
<TAG9>00000232343d3062</TAG9>
<TAG10>204923</TAG10>
<TAG11>http://www.mysqlperformanceblog.com/</TAG11>
<TAG12>http://www.mysqlperformanceblog.com/</TAG12>
<TAG13 date="2006-08-22 11:44:00">
<TAG14></TAG14>
<TAG15>Apachephp
</TAG15>
<TAG16>
Thank you for this bug report. To properly diagnose the problem, we
need a short but complete example script to be able to reproduce
this bug ourselves.
</TAG16>
<TAG17></TAG17>
<TAG18></TAG18>
<TAG19>0</TAG19>
<TAG20></TAG20>
</TAG13>
<TAG21></TAG21>
<TAG22></TAG22>
<TAG23>2006-08-22 23:19:43</TAG23>
<TAG24>Qwerrt</TAG24>
<TAG25>1</TAG25>
<TAG26>http://www.mysqlperformanceblog.com/</TAG26>
<TAG27>http://www.mysqlperformanceblog.com/</TAG27>
<TAG28>1</TAG28>
<TAG29>918180</TAG29>
<TAG30> MySQL Performance tuning optimization consulting</TAG30>
<TAG31></TAG31>
<TAG32>Simple XML </TAG32>
<TAG33>0</TAG33>
<TAG34>0</TAG34>
<TAG35>1</TAG35>
<TAG35></TAG35>
<TAG36></TAG36>
</TAG2>
</TAG1>';
function ProcessFile($filename)
{
global $XML;
$xml = simplexml_load_string($XML);
echo "Memory: ".memory_get_usage() . "\n";
foreach ($xml->report as $reports)
{
//echo $reports->forumid."\n";
}
// var_dump($xml);
unset($xml);
}
while(true)
{
ProcessFile($file);
echo "Loop ".($i++).", memory used: ".memory_get_usage() .
"\n";
}
?>
output:
Loop 1, memory used: 57844
...
Loop 1000, memory used: 269632
..
Loop 5000, memory used: 1461740
..
Loop 10000, memory used: 2914996
Loop 65531, memory used: 17047104
Memory: 17047104
Fatal error: Allowed memory size of 16777216 bytes exhausted (tried to
allocate 3145728 bytes) in /mnt/data/home/vadim/testfeed/testxml2.php
on line 57
------------------------------------------------------------------------
[2006-08-28 08:49:54] [EMAIL PROTECTED]
Thank you for this bug report. To properly diagnose the problem, we
need a short but complete example script to be able to reproduce
this bug ourselves.
A proper reproducing script starts with <?php and ends with ?>,
is max. 10-20 lines long and does not require any external
resources such as databases, etc. If the script requires a
database to demonstrate the issue, please make sure it creates
all necessary tables, stored procedures etc.
Please avoid embedding huge scripts into the report.
------------------------------------------------------------------------
[2006-08-28 08:46:08] apachephp at gmail dot com
Well, I don't have XML files with 10 bytes,
and with 10Mb files my memory is exhausted after processing 20 files.
Memory is OK if I am processing files one per run.
------------------------------------------------------------------------
The remainder of the comments for this report are too long. To view
the rest of the comments, please view the bug report online at
http://bugs.php.net/38604
--
Edit this bug report at http://bugs.php.net/?id=38604&edit=1
