Online counter using session_save_path()

online.php

<?php

define("MAX_IDLE_TIME", 3); 


class online{
	function who(){
		$path = session_save_path();
		if (trim($path)=="") {
		    return FALSE;
		}
		$d = dir( $path); $i = 0;
		while (false !== ($entry = $d->read())) {
				
			if ($entry!="." and $entry!="..") {
				if (time()- filemtime($path."/$entry") < MAX_IDLE_TIME * 60) {
					$i++;
				}
			}
		}
		$d->close();
		
		return $i;
	}
	
}




?>