Fuzzy status of who's online at reddit

This is some quick and dirty little code to test without much precision if any particular user is online over at Reddit.

$url='http://www.reddit.com/user/HattoriHanzo.json';

//get the url | json decode it to an array
$j=json_decode(file_get_contents($url),1);
//this just grabs the first element and then its timestamp
$t=$j[data][children][0][data][created_utc];

//this is a delay of 15 min. use std. timestamp math
if((time()-$t) < (60 * 15)){
	//and they are online ;)
}

//or offline ;(

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