Anonymous function (aka Closure, Lambda) in PHP are very useful, it allows us to do functional programming (well in a sense we can create higher order function ). Here are some usages of anonymous function.
1. Create a Lambda function:
Anonymous function does not have any name but we can assign it to a variable.
2. Use as function argument:
We can use anonymous function as function argument, php also provides a callable type hint that we can use. Here is an example to create a decorator using anonymous function.
3. Use as function return value:
We can also use anonymous function as function return value, welcome to function currying.