PHP/Google Chart API/Mysql data

<?php
require "conf.php";
try {
    $conn = new PDO("mysql:host=localhost;dbname=$dbname", $dbuser, $dbpass);
    $conn->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
    $result = $conn->query('SELECT date_format(Czas,"%Y") as rok,
                date_format(Czas,"%m")-1 as miesiac,
                date_format(Czas,"%d") as dzien,
                date_format(Czas,"%H") as godzina,
                date_format(Czas,"%i") as minuta,
                 temp1 FROM temperatury_log where Czas >= DATE_SUB(NOW(), INTERVAL 1 DAY)');
    $licznik = 0;
    $min = 100; // heheszka taka
    $max = 0;
    $cialko = 'data.addRows([ ';
    foreach ($result as $r) {
        $cialko.='[new Date(' . $r['rok'] . ', ' . $r['miesiac'] . ', ' . $r['dzien'] . ', ' . $r['godzina'] . ', ' . $r['minuta'] . '), ' . $r['temp1'] . '],';
        if ($r['temp1'] > $max) {
            $max = $r['temp1'];
        };
        if ($r['temp1'] < $min) {
            $min = $r['temp1'];
        };
        $licznik++;
    }
    substr_replace($cialko, "", -1);
    $cialko.=']);';
} catch (PDOException $e) {
    echo 'ERROR: ' . $e->getMessage();
}
?>
<html>
    <head>
        <!--Load the Ajax API-->
        <script type="text/javascript" src="https://www.google.com/jsapi"></script>
        <script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.8.2/jquery.min.js"></script>
        <script type="text/javascript">
            google.load('visualization', '1', {packages: ['corechart']});
            google.setOnLoadCallback(drawChart);
            function drawChart() {
                var data = new google.visualization.DataTable();
                data.addColumn('datetime', 'Czaaas');
                data.addColumn('number', 'Temperatura');
<?php echo $cialko; ?>
                var options = {
                    title: 'Temperatury z ostatnich 24 godzin',
                    width: 1300,
                    height: 400,
                    curveType: 'function',
                    pointSize: 5,
                    hAxis: {
                        format: 'HH:mm',
                        gridlines: {count: <?php echo $licznik; ?>}
                    },
                    vAxis: {
                        gridlines: {color: 'none'},
                        minValue: <?php $min--;echo number_format($min, 0, '', ''); ?>,
                        maxValue: <?php $max++;echo number_format($max, 0, '', ''); ?>
                    }
                };
                var chart = new google.visualization.AreaChart(document.getElementById('chart_div'));
                chart.draw(data, options);
            }
        </script>
    </head>
    <body>
        <div id="chart_div"></div>
    </body>
</html>