gistfile1.php

<?php
		private static function find_executable() {
			$filename = basename(pathinfo(__FILE__, PATHINFO_FILENAME));
			if(isset($_SERVER['_']) && substr(basename($_SERVER['_']), -1 * strlen($filename)) != $filename) {
				return $_SERVER['_'];
			}
			$seperator = ':';
			if(strtoupper(substr(PHP_OS, 0, 3)) === 'WIN') {$seperator = ';';}
			$path = explode($seperator, $_SERVER["PATH"]);
			foreach($path as $_path) {
				$test = $_path . DIRECTORY_SEPARATOR . 'php';
				if(file_exists($test) || file_exists($test . '.exe')) {
					return $test;
				}
			}
			throw new Exception("no php executable found");
		}