<?php

namespace common\services;
class ExportService
{
    //导出
    public function export($headlist,$Name,$class)
    {
        ini_set("memory_limit", "2048M");
        set_time_limit(0);
        $params = \Yii::$app->request->post();

        $data = $class->inventory($params);
        //设置导出的文件名
        $fileName = iconv('utf-8', 'gbk', "$Name" . date("Y-m-d"));
        header('Content-Type: application/vnd.ms-excel');
        //指明导出的格式
        header('Content-Disposition: attachment;filename="' . $fileName . '.xsl"');
        header('Cache-Control: max-age=0');
        //打开PHP文件句柄,php://output 表示直接输出到浏览器
        $fp = fopen('php://output', 'a');
        //输出Excel列名信息
        foreach ($headlist as $key => $value) {
            //CSV的Excel支持GBK编码，一定要转换，否则乱码
            $headlist[$key] = $value;
        }
        //将数据通过fputcsv写到文件句柄
        fputcsv($fp, $headlist);
        //每隔$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

        foreach ($data as $k => $v) {
            //刷新一下输出buffer，防止由于数据过多造成问题
            if ($k % $limit == 0 && $k != 0) {
                ob_flush();
                flush();
            }
            $row = $data[$k];
            foreach ($row as $key => $value) {
                $row[$key] = $value;
            }
            fputcsv($fp, $row);
        }
    }

    public static function ExportByCors($parameter)
    {
        ini_set("memory_limit", "2048M");
        set_time_limit(0);
        if (is_array($parameter)) {
            $filename = date('Y-m-d_H-i-s') . '.csv';
//            header('Content-Type: application/vnd.ms-excel');
            header('Content-Type: application/json');
            header('Access-control-Allow-Origin:*');
            header("Content-Disposition: attachment;filename=$filename");
            header('Cache-Control: max-age=0');
            $fp = fopen('php://output', 'w');
            fwrite($fp,chr(0xEF).chr(0xBB).chr(0xBF));
            if ( ! empty($parameter['header']) && is_array($parameter['header'])) {
                fputcsv($fp, $parameter['header']);
            }
            if (isset($parameter['data'])) {
                foreach ($parameter['data'] as $row) {
                    fputcsv($fp, $row);
                }
                exit();
            }
            return true;
        }
        // throw new \yii\web\HttpException(500, "Not a valid parameter!");

    }
}