我想使用mpdf类将html文件转换为pdf。工作正常，但是count > 30页面没有显示，
<?php
include("connection.php");
$phase=mysql_query("select * from session where status=1");
$phasee = mysql_fetch_array($phase);
$mindate = $phasee['st_date'];
$maxdate = $phasee['end_date'];
$query_omr = mysql_query("SELECT * from sit_details a,staff_details b where b.staff_code=a.staff_code and a.val_center=".$_GET['num']);
$staffrowdet = mysql_fetch_array($query_omr);
$query_exam_session = mysql_query("SELECT * from exam_session");
$row_exam_session = mysql_fetch_array($query_exam_session);
$randm=rand(100001,999999);
$text_page='
<style>
table {
width:1000px;
font-family:Times New Roman, Times;
border-collapse: collapse;
text-align:justify;
padding:2px;
font-size:12px;
text-transform: uppercase;
}
td, th {
height:30px;
text-transform: uppercase;
padding:2px;
}
</style>
<table id="simple-table" >
<tr><td colspan="2">
<table>
<tr>
<td rowspan="3"><img src="assets/images/logo.gif" width="80px" /></td>
<td align="center" style="font-size:20px"><strong>Heading1 </strong></td>
</tr>
<tr>
<td align="center" style="font-size:16px"><strong>Heading2 - '. $row_exam_session['session'].' </strong> </td>
</tr>
<tr>
<td align="center" style="font-size:14px"><strong>DETAIL</strong></td>
</tr>
</table>
</td></tr>
<tr><td colspan="2">
<table id="dynamic-table" class="table table-striped table-bordered table-hover" width="900" align="left">
<tr>
<th colspan="6" style="font-size:14px" align="left">PERIOD : FROM <u>'.$mindate .' </u> TO <u>'.$maxdate.' </u> </th>
</tr>
<div style="width:50px;height:50px;border:1px solid #000;"></div>
</table>
</td></tr>
<tr>
<td>
<strong><caption> Form Details</caption> </strong>
<table id="dynamic-table" class="table table-striped table-bordered table-hover" border="1" style="page-break-inside: avoid"> <tr bgcolor="#CCCCCC" >
<th align="center" width="50px"><label class="control-label bolder blue">Sl.No </label></th>
<th align="center" width="100px"><label class="control-label bolder blue">Staff ID </label></th>
<th align="left" width="100px"><label class="control-label bolder blue"> Staff Name</label></th>
<th align="left" width="100px"><label class="control-label bolder blue"> Designation </label></th>
</tr>';
$c1=0;
while($row_dummy = mysql_fetch_array($query_omr)) {
$text_page=$text_page.'
<tr>
<td align="center"><h3>'. $c1 .'</h3></td>
<td align="center"><h3>'. $row_dummy['staff_code'].'</h3></td>
<td align="left"><h3>'. $row_dummy['staff_name'].'</h3></td>
<td align="left"><h3>'. $row_dummy['staff_designation'].'</h3></td>
</tr>';
$c1++;
}
$text_page=$text_page.'
<tr>
<table >
</tr>
</table>
</table>
</td>
</tr>
<table id="dynamic-table" class="table table-striped table-bordered table-hover" border="1" width="800" >
<tbody>
<tr>
<th align="center" width="300px" ></th> <br/>
<th align="center" width="150px">Post Held</th>
<th align="center" width="250px">Name</th>
<th align="center" width="50px">Signature</th>
</tr>
<tr>
<td> </td>
<td align="center" height="70"><strong> <br/> Officer / <br/> Coordinator </strong> </td>
<td height="70"></td>
</tr>
<tbody>
<td align="right" width="300px" valign="bottom" rowspan="2" > </td>
</table>
</table>
<table>
<tr><td align="left"><h4>'.$randm.'</h4></td><td align="right"><h4>'.date('d-m-Y H:i:s').'</h4></td></tr>
</table>
';
//echo $text_page;
//exit;
ob_end_clean();
ini_set('memory_limit', '500000M');
include("MPDF57/mpdf.php");
//$mpdf = new mPDF('c', 'A4-L','0', '0', '10', '10','10', '10');
$mpdf = new mPDF(
'', // mode - default ''
'A4', // format - A4, for example, default ''
0, // font size - default 0
'', // default font family
10, // margin_left
10, // margin right
5, // margin top
0, // margin bottom
5, // margin header
5, // margin footer
'P' // L - landscape, P - portrait
);
$mpdf->autoPageBreak = true;
$mpdf->AddPage();
$fname=$_GET['num'].".pdf";
$mpdf->SetWatermarkImage('assets/images/logo.jpg');
$mpdf->setFooter('{PAGENO}');
$mpdf->showWatermarkImage = true;
$mpdf->WriteHTML($text_page);
$mpdf->Output($fname, 'D');
exit;
?>
已下载pdf，但如果count<30页没有响应，则rowcount>30。如何解决这个错误。我找不到解决方案。请提出其他符合我要求的mpdf示例程序。