Expert guidance, how to add the function of sending text messages to mobile phones in the website?

The program is very simple, it is a problem of the mobile phone SMS interface.

You can go to the Internet to find an interface website, such as: /

Register a user, recharge, and find which interface function in "Secondary Development".

Just connect it to your website.

Any website language can be used, just use whichever you are proficient in.

Technical articles----If there are helpful documents, go and read them yourself.