PHP：读取包含UDP数据包的二进制文件
我有一个程序，它监听其他程序发送的一些 udp 数据包并将其保存到文件中。我需要在 php 中创建一个解析器，以准备好从正在侦听的其他程序捕获的信息。
我正在尝试使用 un_pack 获取 UDP 标头，从中我可以获取内容，但端口和长度标头与程序提供给我的当前日志不匹配，所以我认为我做错了什么。我对这类东西有点陌生，但下面是我正在发生的事情。
$i = 0;
$sourceport = unpack("S", $content[$i++].$content[$i++]);
$targetport = unpack("S", $content[$i++].$content[$i++]);
$length = unpack("S", $content[$i++].$content[$i++]);
$checksum = unpack("S", $content[$i++].$content[$i++]);
哦，还有一件事，我真的不知道如何解析数据，它只是纯文本还是我需要用它做其他事情？
I have a program which listens to some udp packets being sent by other programs and saves it to a file. I need to make a parser in php to ready in the information which was captured from the other program which was listening.
I am attempting to use un_pack to get the UDP header, from which I could get the contents, but the ports and length headers do not match up with the current logs that the program is giving me so I think I am doing something wrong. I am kinda new to this kind of stuff, but bellow is what I have going on.
$i = 0;
$sourceport = unpack("S", $content[$i++].$content[$i++]);
$targetport = unpack("S", $content[$i++].$content[$i++]);
$length = unpack("S", $content[$i++].$content[$i++]);
$checksum = unpack("S", $content[$i++].$content[$i++]);
Oh and one more thing, I don't really know how to parse the data, will it just be in plain text or will I need to do something else with it?
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这实际上取决于程序如何将 UDP 数据包保存到文件中。我建议您查看该文件，并将其与您期望在 UDP 数据包中看到的值进行比较。如果您无法理解要读取的文件的格式，您将无法编写程序来解析它。
It really depends on how the program saves the UDP packets to the file. I suggest you look at the file, and compare it to the values you would expect to see in a UDP packet. If you can't understand the format of the file you're trying to read, you won't be able to write a program to parse it.