is cloudlinux limited readdir php function ?

[ffeingol]

I have problem with one script looks like this:

if( is_dir($dir) ){
if($handle = opendir($dir)) {
while (false !== ($file = readdir($handle))) {
echo $dir .<b>. $file.</b><br />;
}
closedir($handle);
}
}

On i.e. CentOS this reads many files in directory
but on cloudlinux reads only 10 first files, and then stops.

How to discover why it is so ? I set in LVE Manager 3GB of ram, but I can see that script reach the limit.

It should be something else, but where to search for such limits in read files ?

What could it be ?