PHP getIp method

PHP-getIp

function getIp() {
	if (getenv ( "HTTP_CLIENT_IP" ) && strcasecmp ( getenv ( "HTTP_CLIENT_IP" ), "unknown" )) {
		$ip = getenv ( "HTTP_CLIENT_IP" );
	} else if (getenv ( "HTTP_X_FORWARDED_FOR" ) && strcasecmp ( getenv ( "HTTP_X_FORWARDED_FOR" ), "unknown" )) {
		$ip = getenv ( "HTTP_X_FORWARDED_FOR" );
	} else if (getenv ( "REMOTE_ADDR" ) && strcasecmp ( getenv ( "REMOTE_ADDR" ), "unknown" )) {
		$ip = getenv ( "REMOTE_ADDR" );
	} else if (isset ( $_SERVER ['REMOTE_ADDR'] ) && $_SERVER ['REMOTE_ADDR'] && strcasecmp ( $_SERVER ['REMOTE_ADDR'], "unknown" )) {
		$ip = $_SERVER ['REMOTE_ADDR'];
	} else {
		$ip = "unknown";
	}
	if (strpos ( $ip, ',' )) {
		$ipArr = explode ( ',', $ip );
		$ip = $ipArr [0];
	}
	return ($ip);
}