What is a lambda function

A lambda function is a small anonymous function that can take any number of arguments but can only have one expression. It is a feature that allows for creating quick, throwaway function definitions inline without needing to formally define a function using the `def` keyword. Lambda functions are often used for short, simple operations and can be very useful when working with higher-order functions, such as map, filter, and reduce.

$square = function($x) { return $x * $x; }; echo $square(4); // Outputs: 16

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