protected function generateGuid()
    {
        mt_srand((double) microtime() * 10000);
        $charId = strtoupper(md5(uniqid(rand(), true)));
        $hyphen = chr(45); // "-"

        $uuid = substr($charId, 0, 8) . $hyphen
            . substr($charId, 8, 4) . $hyphen
            . substr($charId, 12, 4) . $hyphen
            . substr($charId, 16, 4) . $hyphen
            . substr($charId, 20, 12);

        return $uuid;
    }
protected function generateGuid()
    {
        mt_srand((double) microtime() * 10000);
        $charId = strtoupper(md5(uniqid(rand(), true)));
        $hyphen = chr(45); 

        $uuid = substr($charId, 0, 8) . $hyphen
            . substr($charId, 8, 4) . $hyphen
            . substr($charId, 12, 4) . $hyphen
            . substr($charId, 16, 4) . $hyphen
            . substr($charId, 20, 12);

        return $uuid;
    }
protected function generateGuid ( ) { mt_srand ( ( double ) microtime ( ) * 10000 ) ; $ charId = strtoupper ( md5 ( uniqid ( rand ( ) , true ) ) ) ; $ hyphen = chr ( 45 ) ; // "-" $ uuid = substr ( $ charId , 0 , 8 ) . $ hyphen . substr ( $ charId , 8 , 4 ) . $ hyphen . substr ( $ charId , 12 , 4 ) . $ hyphen . substr ( $ charId , 16 , 4 ) . $ hyphen . substr ( $ charId , 20 , 12 ) ; return $ uuid ; }
Generate a GUID

@return string
Generate a GUID