1，excel的单元格坐标，从A1开始，纵向递增数字的值，横向递增字母，当横向字母变为Z后，下一个字母为AA，然后AB，...，ZZ，...，AAA...

2，纵向坐标简单，根据每条数据的索引值就可以计算得出

3，横向坐标，可以发现是一种类似26进制的字母数字，A如果看作0，那Z表示25。但是这种数字与我们常见的16进制，8进制等又不太一样，因为当Z进位的时候，下一个数不是BA，而是AA。常见的进制中，如十进制9进位，变成10，而不是00；16进制0xF进位，变为0x10，而不是0x00。因此可以参考进制转换的算法，然后变化一下，得出计算excel的横向坐标的方法(10进制转伪26进制)：

//AAA转换

public function toAAA($dec)

{

if ($dec < 0) return '';

$y = $dec % 26;

$x = floor($dec / 26);

return self::toAAA($x - 1) . chr($y + 65);

}

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4，导出Excel通用方法(开发时用的是tp5框架)

//导出xls

public function exportXls($array)

{

set_time_limit(0);

vendor('PHPExcel.PHPExcel');

$titles = $array['titles'];

$fields = $array['fields'];

$list = $array['list'];

$name = $array['name'];

$count = count($titles);

$keys = [];//A=>chr(65)

foreach ($titles as $k => $v) {

$keys[] = $this->toAAA($k);

}

/*$keys打印结果

array(6) {

[0] => string(1) "A"

[1] => string(1) "B"

[2] => string(1) "C"

[3] => string(1) "D"

[4] => string(1) "E"

[5] => string(1) "F"

}*/

$exportTime = '导出日期：'.date('Y/m/d h:i:s',time());

$objPHPExcel = new \PHPExcel();

$objPHPExcel->getProperties()

->setTitle($name)

->setKeywords("excel")

->setCategory("result file");

$objPHPExcel->setActiveSheetIndex(0);

$activeSheet = $objPHPExcel->getActiveSheet();

$activeSheet->getStyle("A1:{$keys[$count-1]}1")->getAlignment()->setHorizontal(\PHPExcel_Style_Alignment::HORIZONTAL_CENTER);

$activeSheet->mergeCells("A1:{$keys[$count-1]}1");//A1:F1

$activeSheet->mergeCells("A2:{$keys[$count-1]}2");//A2:F2

$activeSheet->setCellValue('A1', $exportTime);

$activeSheet->setCellValue('A2', $name);

//设置title,样式

foreach ($titles as $key => $title) {

$activeSheet->setCellValue($keys[$key] . '3', $title);

$activeSheet->getColumnDimension($keys[$key])->setWidth(16);

//$activeSheet->getRowDimension(($key + 1))->setRowHeight(18);

}

$i = 4;

foreach ($list as &$item) {

foreach ($keys as $k => $v) {

//$val = isset($item[$fields[$k]]) ? $item[$fields[$k]] . ' ' : ' ';

$val = isset($item[$fields[$k]]) ? $item[$fields[$k]] : ' ';

$activeSheet->setCellValue($v . $i, $val);

}

$i++;

}

//第一行靠右对齐

$objPHPExcel->getActiveSheet()->getStyle('A1')->getAlignment()->setHorizontal(\PHPExcel_Style_Alignment::HORIZONTAL_RIGHT);

//第二行标题

$objPHPExcel->getActiveSheet()->getStyle('A2')

->getFont()->getColor()

->setARGB(\PHPExcel_Style_Color::COLOR_RED);

$objPHPExcel->getActiveSheet()->getStyle('A2')

->applyFromArray(

array(

'font'=>array(

'size'=>20,

'bold'=>true

),

'alignment' => array(

'horizontal' =>\PHPExcel_Style_Alignment::HORIZONTAL_CENTER

)

)

);

//设置默认全部居中

$objPHPExcel->getDefaultStyle()->getAlignment()->setHorizontal(\PHPExcel_Style_Alignment::HORIZONTAL_CENTER);

$objPHPExcel->getDefaultStyle()->getAlignment()->setVertical(\PHPExcel_Style_Alignment::VERTICAL_CENTER);

//第三行父表头格式

$objPHPExcel->getActiveSheet()->getStyle("A3:{$keys[$count-1]}3")->applyFromArray(array('font'=>array('size'=>12,'bold'=>true)));

ob_end_clean(); //清除bom头

ob_start();

header( 'Pragma: public' );

header( 'Expires: 0' );

header( 'Cache-Control:must-revalidate, post-check=0, pre-check=0' );

header( 'Content-Type:application/force-download' );

header( 'Content-Type:application/vnd.ms-execl' );

header( 'Content-Type:application/octet-stream' );

header( 'Content-Type:application/download' );

header( 'Content-Disposition:attachment;filename='. $name.'.xlsx' );

header( 'Content-Transfer-Encoding:binary' );

$objWriter = \PHPExcel_IOFactory::createWriter( $objPHPExcel, 'Excel2007' );

$objWriter->save( 'php://output' );

exit();

}

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5，调用导出方法，传入表头，字段，文件名，导出数据数组即可。