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PHPExcel execl转化成csv

https://m.php.cn/faq/458865.html

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$filename = "myexcel.xlsx";
$objReader = PHPExcel_IOFactory::createReader('Excel2007');
$objPHPExcel = $objReader->load($filename);

$objWriter = PHPExcel_IOFactory::createWriter($objPHPExcel, 'CSV');
$objWriter->save(str_replace('.xlsx', '.csv', $filename));