PHP Functions

Learn about functions in PHP and their types.

Functions in PHP

Functions are the heart of functional programming. Functions are relationships between inputs and outputs. The arity of a function is the number of arguments a function accepts, and the function signature specifies return types and argument types. Lastly, the definition of a function encapsulates the function logic. Here’s a mathematically defined function:

f(x)=x+1f(x) = x + 1 ...