Best way to find php executable

php_executable_finder.php

<?php

function getPHPExecutable() {
	$phpExecutable = file_exists('/usr/bin/php') ? '/usr/bin/php' : false;

	if (!$phpExecutable) {
		exec('which php', $phpExecutableRawPath);

		if (!strpos($phpExecutableRawPath[0], '/php')) {
			if (!strpos(PHP_BINARY, '/php'))
				die('No PHP executable found!');
			else
				$phpExecutable = PHP_BINARY;
		}

		$phpExecutable = $phpExecutableRawPath[0];
	}

	return $phpExecutable;
}