How can I make an app/software

Question

I've done the coding and analysis but I don't know how to make the codes into an app that can be shared or downloaded

Answer 1

You can only know this when you start building something.
Choose app idea, try to cut it in smaller problems-steps, solve one step at time, google a lot, and you will do it.
Next time when you build similar app, you will know how to do something, everything comes with practice. Thats why choose some easier app what have tutorial on language you will use, and try to build by yourself, if you stuck you can watch tutorial and see how someone else is solved this problem.

Answer 2

You mentioned the PHP tag in your question. Are you aware how PHP works, and how internet web pages are served to browsers? When visiting a website, the PHP engine that runs on the web server, creates a webpage dynamically. You can download the static result but it will remain "dead" to the client, and the original code will not be visible.
To share your work with others, publish your website on a server which has php support. There are many such services, some of them even free. You can buy a domain name too and link it with this server IP address, so your website would have a unique location on the internet.
There are other models for writing software, which have different methods of distribution. You can write command line apps or GUI apps that can be downloaded or installed. You can also write mobile apps which can be published in the app store. Or single page web apps, or dynamic webpages that use only frontend JavaScript and no backend. So many paths.