Expressions: Closures #

Anonymous Functions #

Anonymous functions are functions that are not named. They are created using the function keyword.

$variable = function (string $argument): string {
    return $argument;
};

Capturing Variables #

Anonymous function don't capture variables from parent scope by default. To capture a variable from the parent scope, you must use the use keyword.

$variable = 'value';

$anonymous_function = function () use ($variable): string {
    return $variable;
};

Arrow Functions #

Arrow functions are short anonymous functions that are created using the fn keyword.

$variable = fn (string $argument): string => $argument;