PHP - unzip to cwd

unzip.php

<?php
	
	$zipfile = (isset($_GET['z'])) ? $_GET['z'] : false;

	if($zipfile){

		$zip = new ZipArchive;
		$res = $zip->open($zipfile);

		if($res === true){
			$zip->extractTo('./');
			$zip->close();
			unlink(__FILE__);
		}else{
			echo "No file found!";
		}
	}else{
		echo "File not specified";
	}

?>