MPDF没有正确编写HTML页脚

Question

我使用mpdf生成pdfs。因此在处理HTML页脚时存在问题。我的配置是这样的;

private $pdfMode = ''; //For loading fonts
private $pageFormat = 'A4'; //Default is A4 size
private $marginLeft = 2;
private $marginRight = 2;
private $marginTop = 2; 
private $marginBottom =2;
private $marginHeader = 9;
private $marginFooter = 9;


function __construct() {
    parent::mPDF($this->pdfMode, $this->pageFormat, '', '',$this->marginLeft,$this->marginRight, $this->marginTop, $this->marginBottom, $this->marginHeader, $this->marginFooter);
    $this->setAutoTopMargin= true;
    $this->setAutoBottomMargin = true;
    parent::SetAutoFont(AUTOFONT_ALL);
}

当设置AutoTopMargin为true时，即使标题太大，它也能正常工作。但页脚内容被裁剪，身体和页脚之间有太多空间

请帮忙...