public function exportCsv($filepath, $data = [], $header = []){
$file = fopen($filepath, 'w'); // 添加 BOM,解除中文乱码
fwrite($file, chr(0xEF).chr(0xBB).chr(0xBF)); // 输入头
if ($header) {
fputcsv($file, $header);
} // 输入数据
foreach ($data as $item) {
fputcsv($file, $data);
}
fclose($file); return $filepath;
}