PHP is used for general purposes in web development. Adding functionalities developed in PHP helps to make a website more interactive and dynamic. Among PHP solutions we can name online calculators for websites, different types of converters, website search and login systems, cookies and dynamic signatures. As for PHP developer salary, it can vary from country to country. There is a good article on the topic -
https://diceus.com/programmers-salar...expertise-php/. Hopefully, someone will find it interesting and useful!