Implementation code for php to export Excel files in csv format

<?php
require_once "./Export.php";//测试数据
$headerList= [&#39;列名1&#39;,&#39;列名2&#39;,&#39;列名3&#39;];
$data = [
    [&#39;值1&#39;,&#39;值2&#39;,&#39;值3&#39;],
    [&#39;值11&#39;,&#39;值22&#39;,&#39;值33&#39;],
    [&#39;值111&#39;,&#39;值222&#39;,&#39;值333&#39;]
];
$fileName = "测试导出文件名";
$tmp = [&#39;备份字段1&#39;,&#39;备份值1&#39;,&#39;&#39;,&#39;备份字段2&#39;,&#39;备份值2&#39;];
$export = new Export();$result = $export->exportToCsv($headerList,$data,$fileName,$tmp);

<?php
class export{
    /**
     * params $headerList 头部列表信息(一维数组) 必传
     * params $data 导出的数据(二维数组)    必传
     * params $filename 文件名称转码 必传
     * params $tmp 备用信息(二维数组) 选传
     * PS:出现数字格式化情况，可添加看不见的符号，使其正常，如:"\t"
     **/
    public function exportToCsv($headerList = [] , $data = [] , $fileName = &#39;&#39; , $tmp = []){
        //文件名称转码
        $fileName = iconv(&#39;UTF-8&#39;, &#39;GBK&#39;, $fileName);        //设置header头
        header(&#39;Content-Type: application/vnd.ms-excel&#39;);
        header(&#39;Content-Disposition: attachment;filename=&#39; . $fileName . &#39;.csv&#39;);
        header(&#39;Cache-Control: max-age=0&#39;);        //打开PHP文件句柄,php://output,表示直接输出到浏览器
        $fp = fopen("php://output","a");        //备用信息
        foreach ($tmp as $key => $value) {            
        $tmp[$key] = iconv("UTF-8", &#39;GBK&#39;, $value);
        }       
         //使用fputcsv将数据写入文件句柄
        fputcsv($fp, $tmp);        
        //输出Excel列表名称信息
        foreach ($headerList as $key => $value) {            
        $headerList[$key] = iconv(&#39;UTF-8&#39;, &#39;GBK&#39;, $value);//CSV的EXCEL支持BGK编码，一定要转换，否则乱码
        }        
        //使用fputcsv将数据写入文件句柄
        fputcsv($fp, $headerList);        //计数器
        $num = 0;        
        //每隔$limit行，刷新一下输出buffer,不要太大亦不要太小
        $limit = 100000;       
         //逐行去除数据,不浪费内存
        $count = count($data);        
        for($i = 0 ; $i < $count ; $i++){           
        $num++;            、
        //刷新一下输出buffer，防止由于数据过多造成问题
            if($limit == $num){
                ob_flush();
                flush();                
                $num = 0;
            }            
            $row = $data[$i];            
            foreach ($row as $key => $value) {                
            $row[$key] = iconv(&#39;UTF-8&#39;, &#39;GBK&#39;, $value);
            }
            fputcsv($fp, $row);
        }
    }
}