blocks|key|1296914|text|您可能需要研究一下php+exec。PHP不允许通过API直接访问硬件，需要调用子程序来实现。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1296915|entityMap|0|LINK|mutability|MUTABLE|url|http://php.net/exec^0|9|8|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@$A|M|B|N|1|O]]|C|$]]|$1|D|3|-4|5|6|7|P|8|@]|9|@]|C|$]]]|E|$F|$5|G|H|I|C|$J|K]]]]

You might want to look into <a href="http://php.net/exec" rel="nofollow noreferrer">php exec</a>. PHP doesn't allow Direct access to Hardware through the API, you need to call sub-programs to do that.

blocks|key|1082059|text|如果可以用PHP语言编写与该设备通信的程序，就可以创建一个C%2B%2B扩展：http://www.devarticles.com/c/a/Cplusplus/Developing-Custom-PHP-Extensions-Part-1/|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1082060|entityMap|0|LINK|mutability|MUTABLE|url|http://www.devarticles.com/c/a/Cplusplus/Developing-Custom-PHP-Extensions-Part-1/^0|Z|29|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@$A|M|B|N|1|O]]|C|$]]|$1|D|3|-4|5|6|7|P|8|@]|9|@]|C|$]]]|E|$F|$5|G|H|I|C|$J|K]]]]

If you can write a program in C++ that communicates with that device, you can create a PHP extension: <a href="http://www.devarticles.com/c/a/Cplusplus/Developing-Custom-PHP-Extensions-Part-1/" rel="nofollow noreferrer">http://www.devarticles.com/c/a/Cplusplus/Developing-Custom-PHP-Extensions-Part-1/</a>

blocks|key|1081930|text|你必须编写一个可以通过系统调用来调用的程序。PHP代码不能直接访问你的硬件。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1081931|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

You have to write a program that you can call via system calls. PHP code can't access your hardware directly.

blocks|key|1296969|text|根据我对菲利普·埃克伯格的answer....maybe的评论。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1296970|这取决于您的操作系统和所需的访问级别-是否应该是双向的？您是否正在尝试将控制线用于流量控制以外的其他目的？您知道通信协议的详细信息吗？|1296971|结果表明，C.|1296972|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|H|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|I|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|J|8|@]|9|@]|A|$]]|$1|F|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|G|$]]

As per my comment on Filip Ekberg's answer....maybe.

It depends on your OS and the level of access required - should it be bi-directional? Are you trying to use the control lines for purposes other than flow control? Do you know the details of the communications protocol?

C.

blocks|key|1297100|text|如果你打算在*NIX系统上运行它，你可能想看看Plan+9+From+User+Space。使用这些库，您可以编写一个C程序，使您的硬件显示为文件系统的一部分，例如，您可以像挂载USB驱动器一样挂载它。挂载后，您可以使用PHP的函数来操作文件来控制硬件。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1297101|如果你不知道9号计划是什么，这可能不是很清楚。让我用一个虚拟的例子来说明:你的硬件是一个电子板，通过一个7段显示器显示登录用户的数量。您可以从用户空间使用Plan+9来编写一个挂载2个文件的程序：|1297102|/某处/输入|1297103|/某处/输出|1297104|将"+42“(就像你对文本文件所做的那样)写入input将使您的面板显示42。例如，读取输出会告诉你这个数字有多长时间没有改变。|1297105|这可能不是实现目标的最简单的方法，因为学习使用Plan+9库并不容易(虽然IRC上的人非常友好和乐于助人)，但在我看来，这是最优雅的方法。|1297106|有了这个，你还可以从任何其他语言控制你的硬件，因为我知道所有的语言都可以操作文件。|1297107|entityMap|0|LINK|mutability|MUTABLE|url|http://swtch.com/plan9port/^0|N|M|0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|X|8|@]|9|@$A|Y|B|Z|1|10]]|C|$]]|$1|D|3|E|5|6|7|11|8|@]|9|@]|C|$]]|$1|F|3|G|5|6|7|12|8|@]|9|@]|C|$]]|$1|H|3|I|5|6|7|13|8|@]|9|@]|C|$]]|$1|J|3|K|5|6|7|14|8|@]|9|@]|C|$]]|$1|L|3|M|5|6|7|15|8|@]|9|@]|C|$]]|$1|N|3|O|5|6|7|16|8|@]|9|@]|C|$]]|$1|P|3|-4|5|6|7|17|8|@]|9|@]|C|$]]]|Q|$R|$5|S|T|U|C|$V|W]]]]

If you intend to run this on a *NIX system, you may want to look at <a href="http://swtch.com/plan9port/" rel="nofollow noreferrer" title="Plan 9 from User Space">Plan 9 From User Space</a>. With these libraries, you could write a C program that make your hardware appear as a part of your file system, i.e. you mount it as you would mount a USB drive, for example.
Once mounted, you can use PHP's function for manipulating files to control your hardware.

If you don't know what Plan 9 is, this may not be very clear. Let me illustrate by an dummy example : your hardware is an electronic board displaying the number of logged in user via a 7 segment display. You use Plan 9 from user space to write a program that mounts 2 files :

/somewhere/input

/somewhere/output

Writing "42" (as you would do with a text file) to input will make your board display 42.
Reading output will for example tell you for how long this number did not change.

This may not be the easiest way to achieve your goal, as learning to use the Plan 9 libraries is not very easy (although people on IRC are very nice and helpful), but it is in my opinion the most elegant way.

With this, you would also be able to control your hardware from any other language, for all languages I know can manipulate files.

blocks|key|1297161|text|好吧，它是一个LPT端口和一个二进制文件，Lin和Win和小PHP代码都可以调用这个二进制文件：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1297162|http://www.epanorama.net/circuits/parallel_output.html|offset|length|1297163|entityMap|0|LINK|mutability|MUTABLE|url^0|0|0|1I|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|N|8|@]|9|@$D|O|E|P|1|Q]]|A|$]]|$1|F|3|-4|5|6|7|R|8|@]|9|@]|A|$]]]|G|$H|$5|I|J|K|A|$L|C]]]]

Well, it was an LPT port and a binary, both for Lin and Win and small PHP code to call this binary: 

<a href="http://www.epanorama.net/circuits/parallel_output.html" rel="nofollow noreferrer">http://www.epanorama.net/circuits/parallel_output.html</a>

blocks|key|1082190|text|您可能需要使用socket+io+npm包查看Node+js。我已经建立了一个笑脸系统，我可以通过web+api接口直接控制我的硬件。我的linux机器是Raspberry+pi，它正在控制连接到ots+/O的硬件。我的Node+js网络服务器是在raspberry+Pi中，Node+js不仅可以从前端javascript监听web指令，还可以通过npm硬件I/O包控制硬件。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1082191|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

You might wanna look into Node js with socket io npm package.. I have built a smiliar system where I can control my hardware directly through web api interface.
My linux machine is Raspberry Pi that is controlling a hardware attached to ots I/O. My Node js webserver is in raspberry pi, Node js not only listen web instruction from front end javascript but can also control hardware through npm hardware I/O packages.

I wondered if I can use PHP to control an external hardware connected with the parallel port or USB port ?
any ideas or resources ?

Can I control hardware via PHP Language?

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我想知道我是否可以使用PHP来控制通过并行端口或USB端口连接的外部硬件？有什么想法或资源吗？

问可以通过PHP语言控制硬件吗？
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