How to download files from server in php

PHP can download files on the server through the custom function method downtemplateAction(). In its method body, there are functions such as determining whether the file exists, whether it has been successfully downloaded, and closing the file. .

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Specific examples are as follows:

/**
 * @todo 下载文件
 */
public function downtemplateAction(){
    header("Content-type:text/html;charset=utf-8");
    $file_name = "template.xlsx";
    $file_name = iconv("utf-8","gb2312",$file_name);
    $file_sub_path = APP_PATH.'/data/obj/2018-03-21/';
    $file_path=$file_sub_path.$file_name;
    if(!file_exists($file_path))
    {
        echo "下载文件不存在！";
        exit;
    }
 
    $fp=fopen($file_path,"r");
    $file_size=filesize($file_path);
    //下载文件需要用到的头
    Header("Content-type: application/octet-stream");
    Header("Accept-Ranges: bytes");
    Header("Accept-Length:".$file_size);
    Header("Content-Disposition: attachment; filename=".$file_name);
    $buffer=1024;
    $file_count=0;
    while(!feof($fp) && $file_count<$file_size)
    {
        $file_con=fread($fp,$buffer);
        $file_count+=$buffer;
        echo $file_con;
    }
    fclose($fp);    //关闭这个打开的文件
}

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