Here is a better answer to the question “Why use them?” Because it is a closure. Which means you can hide information, such as business logic. Anonymous function is a function without any user defined name. Such a function is also called closure or lambda function. Sometimes, you may want a function for one time use. Closure is an anonymous function which closes over the environment in which it is defined. See also: "Accessing private variables from within a closure", Accessing private/protected properties of an object in anonymous function in PHP – outis Feb 13 '12 at 12:30 add a comment 5 Answers 5 Modifying a variable passed to a PHP anonymous function doesn't appear to be reflected in variables original scope. 2. CakePhp - how to access variables inside find->innerJoinWith? 0. Passing a variable to a lambda-function. 1. Undefined variable using function into function. 0. PHP: Pass anonymous function as argument. 57. PHP - If/else, for, foreach, while - without curly braces? 0. PHP shorthand/shortcode conditional IF statement: execute code or return message. 2550. Why shouldn't I use mysql_* functions in PHP? 0. Can Shorthand If/Else statements include on or more Else If? 1. The function that can be created without any specific name and used as an input argument in the PHP script, is known as anonymous function. These functions are implemented using Closure class. The process of assigning an anonymous function to a variable is same as any other assignment syntax. Here we have created a small nameless (Anonymous) function which is used as a callback in the preg_replace_callback function. Although create_function lets you create anonymous functions, it is not truly a part of the language itself but a hack. PHP 5.3 introduced true Anonymous functions in the base language itself. This tells PHP that you’re creating an anonymous function. There is a semicolon after the function definition. This is because anonymous function definitions are expressions , whereas regular function definitions are code constructs . Anonymous function. PHP 5.3 introduced anonymous functions. An anonymous function is a function without a name (nameless function). Anonymous functions can be assigned to variables and passed around just like any other PHP object. But it’s still a function, so you can invoke it and pass it arguments. As of PHP 8.0.0, the list of scope-inherited variables may include a trailing comma, which will be ignored. Inheriting variables from the parent scope is not the same as using global variables. Global variables exist in the global scope, which is the same no matter what function is executing.
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