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How to Use serial port sending and receiving commands in php

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How does php use serial port to send and receive commands? I downloaded a & nbsp; php_dio.dll & nbsp; But I do not know how to call it. Sharing: how can I use serial port to send and receive commands in php?
I have downloaded a php_dio.dll file, but I do not know how to call it.

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------ Solution --------------------
PHP 4> = 4.2.0, PHP 5 <= 5.0.5
Can your php_dio.dll be loaded successfully?
If yes, find "Direct IO function" in the manual"
Both descriptions and examples are available.

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