Generally, the URL means Uniform Resource Locater. Likewise, URL in PHP Programming Language is also the same. URL is nothing but a website address. It helps in connecting the client and the server when browsed using a specific link.

PHP is a dynamically typed language, which means that by default there is no need to specify the type of a variable, as this will be determined at runtime. However, it is possible to statically type some aspect of the language via the use of type declarations.

Web Server: PHP is a server-side language, so you need a web server to run your PHP scripts. Apache and Nginx are popular options. Database Server: PHP often interacts with databases, so you'll need a database server. MySQL and PostgreSQL are commonly used.

PHP documentation in WordPress mostly takes the form of either formatted blocks of documentation or inline comments. The following is a list of what should be documented in WordPress files: Functions and class methods. Classes. Class members (including properties and constants)