PHP简单的HTML Dom和内存

PHP Simple HTML Dom problem Hi I have about 40 urls which I looping through within the loop I have the following

    $html->clear();
    unset($html);
    $html =  file_get_html($value);

After 7 or 8 loops it appears to stop working. I'm thinking this is a memory issue but I can not tell. Has anyone had the same or similar problem. I am using Zend studio and have set a break point in the loop. it is hit for the first 7 or 8 but then nothing happens.

Any help much appreciated,