There Brill tagger is implemented in PHP: How to implement a tag with partial speech (POS) and http://phpir.com/part-of-speech-tagging
You will probably find more if you find Google for "PHP POS PHP Tags". I also have a rudimentary PHP shell for Stanford POS POS testers (which runs in Java), and I would be happy with open source, but since loading the model can take up to five seconds, you may want to use one of the tools related c above if your goal is real-time processing. (You only need to load the model once per session.)
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