Lære Anonymous Functions | Functions in PHP

Definition

Anonymous functions, also called lambda functions or closures, are a special type of function in PHP that do not have a specified name. Instead of declaring them with a name like regular functions, you define them directly and often assign them to a variable.

Anonymous functions especially useful when you need a quick, one-off function, such as when passing a callback to another function or creating small bits of logic that do not require a permanent name in your code.

You should use an anonymous function when you want to:

Create a function for temporary use;
Pass a function as an argument to another function;
Store a function in a variable for later use;
Avoid polluting the global namespace with named functions.

anonymous_function_example.php


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<?php

// Assigning an anonymous function to a variable
$greet = function($name) {
    return "Hello, " . $name . "!";
};

// Calling the anonymous function using the variable
echo $greet("PHP learner");

Anonymous functions are an important feature for writing flexible, reusable, and concise code, especially when working with arrays, callbacks, or event-driven programming.

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