parsePdoDsn.php

<?php 
        $parseDsn = function($pdoDsn)
        {
            $dsnInfo = parse_url($pdoDsn);
            if ( empty($dsnInfo['scheme'])) {
                throw new \Exception("invalid dsn:$pdoDsn");
            }
            $pathInfo = explode(';', $dsnInfo['path']);
            foreach ($pathInfo as $p) {
                $itemInfo = explode('=', $p);
                if (count($itemInfo) != 2) {
                    throw new \Exception("invalid dsn:$pdoDsn");
                }
                $dsnInfo[$itemInfo[0]] = $itemInfo[1];
            }
            return $dsnInfo;
        };