Suggestion: If URL Loads Initially, then stop

Hi there, I don't know if this is the place to do it, but anyway. I have a suggestion for a new function that PHP could have: It will be similar to fopen, but instead of actually loading the URL, it starts loading the page, then once PHP knows that it's started loading, it will stop it before it's finished; then it would set the variable in the function's brackets as true. eg: Functname($URL;$trueorfalse). This could be used to check if a site is up without having to download the whole page. Regards, Ryan