[PHP] Visitor Counter

<?php

	class Counter {
		public static function Get() {
			$file = "cache/counter.txt";			
			$lines = @explode("\r\n", file_get_contents($file)) or array("0");

			$counterAll = (int)$lines[0];
			unset($lines[0]);
			
			$add = true;
			$index = 1;
			foreach($lines as $line) {
				$data = explode("|", $line);
				if(strtotime("-24 hours") > $data[0]) {
					$counterAll++;
					unset($lines[$index]);
				}
				elseif($data[1] == IP())
					$add = false;
				$index++;
			}

			if($add)
				array_push($lines, time() . "|" . IP());
				
			if(!is_dir("cache"))
				mkdir("cache");
	 
			$data = $counterAll;
			foreach($lines as $line)
				$data .= "\r\n" . $line;
			file_put_contents($file, $data);

			$count = count($lines);
			return array("all" => $counterAll + $count, "day" => $count);
		}
	}

?>