php headee,php下载，header控制

public function exportsizetablehistoryAction(){

$params = $this->getRequest()->getParams();

$str = $params['str'];

if(empty($str)){

return false;

}

try {

//下载的核心代码 header控制

$strSize = strlen($str);

header('Content-Description: File Transfer');

header('Content-Type: application/octet-stream');

header('Content-Disposition: attachment; filename="filename.txt"');//下载的文件名

header('Expires: 0');

header('Cache-Control: must-revalidate');

header('Pragma: public');

header('Content-Length: ' . $strSize);//下载文件的大小

echo $str; //下载文件的内容

return true;

} catch (Exception $e) {

return false;

}

}