Where the implement of Machine Learning / Deep Learning / NLP in web development or web application?

I am a newbie web application developer. Already build some application. Recently i see, Machine Learning / Deep Learning / NLP have more value. I wanna know How I can apply Machine Learning / Deep Learning / NLP on web application ? Where the implement of those in Web Application ? And what's the best language for Machine Learning / Deep Learning / NLP ? (I'm a php dev)