php readfile()修改文件上传大小设置

memory_limit = 128M

ini_set('memory_limit', '512M');

set_time_limit(0);
ini_set('memory_limit', '512M');
header("Cache-Control: public");
header("Content-Description: File Transfer");
header('Content-disposition: attachment; filename=' . basename($zipfile));
header("Content-Type: application/zip");
header("Content-Transfer-Encoding: binary");
header('Content-Length: ' . filesize($zipfile));
ob_clean();
flush();
@readfile($zipfile);
unlink($zipfile);