i want to know about php.net language?
php.net is actually a website (that incidentally tells you all about PHP).
Seems like you are new to this forum. Welcome and hope you will find it useful. And since your question is pretty general I suggest you read this article first which will give you some guidance on how to post. A well structured question guarantees quick response and a lot of hints to solve your problem.
There are loads of resorces online such as YouTube Tutorials to learn about PHP>