To develop AI applications, PHP seems not to be the best choice. It is a script language intended to create websites etc., not to, e.g., steer a robot. Of course you can use PHP to learn some concepts, but it makes sense to switch as soon as you want to create “serious” applications related to this topic.
To get into the topic, I recommend the Udacity course “Intro to Articial Intelligence”, see https://www.udacity.com/course/cs271 – it is absolutly free to take this courses.
AI is not a simple topic, but it is very interesting. Good luck and have fun!
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solved Artificial intelligence application development in PHP [closed]