How to export MySQL data to Excel in PHP without third-party libraries

Export MySQL data to Excel without using a third-party library

If you export data frequently, you may encounter the upper limit of exporting with a third-party library, which is very helpless. Things often fail when exporting more than 20,000 pieces of data. It is easy to reach the upper limit of PHP memory usage

// 输出Excel文件头，可把user.csv换成你要的文件名 
header('Content-Type: application/vnd.ms-excel'); 
header('Content-Disposition: attachment;filename="user.csv"'); 
header('Cache-Control: max-age=0'); 
// 从数据库中获取数据，为了节省内存，不要把数据一次性读到内存，从句柄中一行一行读即可 
$sql = 'select * from tbl where ……'; 
$stmt = $db->query($sql); 
// 打开PHP文件句柄，php://output 表示直接输出到浏览器 
$fp = fopen('php://output', 'a'); 
// 输出Excel列名信息 
$head = array('姓名', '性别', '年龄', 'Email', '电话', '……'); 
foreach ($head as $i => $v) { 
 // CSV的Excel支持GBK编码，一定要转换，否则乱码 
 $head[$i] = iconv('utf-8', 'gbk', $v); 
} 
// 将数据通过fputcsv写到文件句柄 
fputcsv($fp, $head); 
// 计数器 
$cnt = 0; 
// 每隔$limit行，刷新一下输出buffer，不要太大，也不要太小 
$limit = 100000; 
// 逐行取出数据，不浪费内存 
while ($row = $stmt->fetch(Zend_Db::FETCH_NUM)) { 
 $cnt ++; 
 if ($limit == $cnt) { //刷新一下输出buffer，防止由于数据过多造成问题 
 ob_flush(); 
 flush(); 
 $cnt = 0; 
 } 
 foreach ($row as $i => $v) { 
 $row[$i] = iconv('utf-8', 'gbk', $v); 
 } 
 fputcsv($fp, $row); 
}

The method here is to use fputcsv to write CSV files and directly output Excel files to the browser.

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