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PHP Functions

Explore the role of functions in PHP within the functional programming paradigm. Understand different types of functions such as named, anonymous, closures, and class methods, and how they contribute to pure function design and immutability.

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 ...