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这是我的代码，请告诉我我错过了什么？

    // Field names in the first row
$sql1 = "SELECT `COLUMN_NAME` 
FROM `INFORMATION_SCHEMA`.`COLUMNS` 
WHERE `TABLE_SCHEMA`='test' 
    AND `TABLE_NAME`='user_tab'";
$res1 = mysql_query($sql1);
while ($row2 = mysql_fetch_assoc($res1)) {
    $fields[] = $row2['COLUMN_NAME'];
}

//Data
$sql = "SELECT * FROM user_tab";
$res = mysql_query($sql);





echo date('H:i:s'), " Load from Excel5 template", EOL;
$objReader = PHPExcel_IOFactory::createReader('Excel5');
$objPHPExcel = $objReader->load("mytest.xls");

$logo = new PHPExcel_Worksheet_HeaderFooterDrawing();
$logo->setName('Logo');
$logo->setPath('image.jpg'); //Path is OK & tested under PHP
$logo->setHeight(38); //If image is larger/smaller than that, image will be proportionally resized
$objPHPExcel->getActiveSheet()->getHeaderFooter()->addImage($logo, PHPExcel_Worksheet_HeaderFooter::IMAGE_HEADER_LEFT);
echo date('H:i:s'), " Add new data to the template", EOL;

$col = 0;
foreach ($fields as $key => $value) {
    $objPHPExcel->getActiveSheet()->setCellValueByColumnAndRow($col, 1, $value);
    $col++;
}

$row = 2;
while ($row_data = mysql_fetch_assoc($res)) {
    $col = 0;
    foreach ($row_data as $key => $value) {
        $objPHPExcel->getActiveSheet()->setCellValueByColumnAndRow($col, $row, $value);
        $col++;
    }
    $row++;
}

$objWriter = PHPExcel_IOFactory::createWriter($objPHPExcel, 'Excel5');
$objWriter->save(str_replace('.php', '.xls', __FILE__));
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