问pChart，如何在x轴上以"12/2-8“这样的月份显示周开始或结束日期？

EN

$weekLegend = getWeekLegend();
var_dump($weekLegend); // for debug purpose 

array (size=8)
  0 => string '12/09-15' (length=8)
  1 => string '12/16-22' (length=8)
  2 => string '12/23-29' (length=8)
  3 => string '12/30-05' (length=8)
  4 => string '01/06-12' (length=8)
  5 => string '01/13-19' (length=8)
  6 => string '01/20-26' (length=8)
  7 => string '01/27-02' (length=8)

// Dataset definition
$DataSet = new pData;
$DataSet->AddPoint($data,"Serie1");
$DataSet->AddPoint(getWeekLegend(),"Serie2");
$DataSet->AddAllSeries();
$DataSet->SetAbsciseLabelSerie("Serie2"); //<------ set pChat to use legend

function getWeekLegend($week = 8) {
    $start = new DateTime();
    $start->modify("last sunday");
    while ( $week > 0 ) {
        $date = $start->format("m");
        $date .= "/";
        $date .= $start->format("d");
        $date .= "-";
        $start->modify("+6 day");
        $date .= $start->format("d");
        $start->modify("+1 day");
        $weekLegend[] = $date;
        $week --;
    }
    return $weekLegend ;
}