php下载文件 php安全下载

[php]代码库

	/**
	 * 下载文件
	 * Enter description here ...
	 * @param unknown_type $file_path 文件所在路径
	 * @param unknown_type $file_name 文件名
	 */
	function download($file_path,$file_name){

		//判断要下载的文件是否存在
		if(!file_exists($file_path)){
			echo '对不起,你要下载的文件不存在。';
			return false;
		}
		$file_size = filesize($file_path);

		header("Content-type: application/octet-stream");
		header("Accept-Ranges: bytes");
		header("Accept-Length: $file_size");
		header("Content-Disposition: attachment; filename=".$file_name);

		$fp = fopen($file_path,"r");
		$buffer_size = 1024;
		$cur_pos = 0;

		while(!feof($fp)&&$file_size-$cur_pos>$buffer_size){
			$buffer = fread($fp,$buffer_size);
			echo $buffer;
			$cur_pos += $buffer_size;
		}

		$buffer = fread($fp,$file_size-$cur_pos);
		echo $buffer;
		fclose($fp);
		return true;
	}

[代码运行效果截图]