Re: Memory leak occurs when exec() function is used on Windows platform

[Elizabeth Smith <emsmith@xxxxxxxxxxxxxxxxxxxxxxx>]

melmack wrote:
> Hi
>
> I have a big problem with shell commands execution via PHP.
> I have written a very short PHP script ilustrating the problem:
>
>
> <?php
>
>
> for($i=0;$i<1000;$i++)
> { 
>   exec("test.bat"); 
>
>
>
> } 
>
>
> ?> 
>
> test.bat is just an empty file. 
>
>
> This script causes about 10 MB memory leak. It can be observed 
> by usage of performance system monitor. This problems occurs in 
> all available enviroments: 
> - IIS Webserver. 
> - Apache webserver 
> - PHP command line interpreter 
>
>
> Memory leak is observable only on Windows platform 
> (tested on Windows XP). On Linux everything works OK. 
>
>
> Does someone know how to solve this problem? Any help appreciated 
>
>
> Best regards 
> Melmack 

I've found exec to be flaky enough on windows that instead I use com to 
spawn the new process.

$shell = new COM('WScript.Shell');
$return = $shell->Run($cmd, 0, false);
unset ($shell);

Faster and no leaks ;)  Only downside is you have to wrap cross-platform 
code with windows detection.

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