Code for PHP download file

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 Public function down () {header (' Content-type:application:json;charset=utf8 ');        Header (' access-control-allow-origin:https://coucouchina.com ');        Header (' Access-control-allow-methods:post ');        Header (' Access-control-allow-headers:x-requested-with,content-type ');        Header ("Content-type:text/html;charset=utf-8");//$file _name= "cookie.jpg";        $file _name = "apple-app-site-association";//To solve the problem of Chinese can not be displayed $file _name = Iconv ("Utf-8", "gb2312", $file _name); $file _sub_path = $_server[' Document_root ').                "/"; $file _path = $file _sub_path.            $file _name;//first to determine if the given file exists or not (!file_exists ($file _path)) {echo "does not have the file file";        Return        } $fp = fopen ($file _path, "R");        $file _size = filesize ($file _path);//Headers ("Content-type:application/octet-stream") to be used for downloading files;        Header ("Accept-ranges:bytes"); Header ("Accept-length:".)        $file _size); Header ("content-disposition:attachment; Filename= ".        $file _name);        $buffer = 1024;  $file _count = 0;//returns data to the browser while (!feof ($fp) && $file _count < $file _size) {$file _con                    = Fread ($fp, $buffer);                    $file _count + = $buffer;        echo $file _con;    } fclose ($FP); }