Closure::getCurrent

Closure::getCurrent

Returns the currently executing closure

Closure **Closure::getCurrent**

Returns the currently executing closure. This method is primarily useful for implementing recursive closures without needing to capture a reference to the closure variable using the keyword. use

This method must be called from within a closure; calling it outside of a closure context will result in Error: Current function is not a closure.

Returns the currently executing instance. Closure

Throws an if called outside of a closure context. Error

Voorbeeld: example

Using  to implement a
recursive Fibonacci function:

Closure::getCurrent

<?php
$fibonacci = function (int $n) {
    if ($n === 0 || $n === 1) {
        return $n;
    }

    $fn = Closure::getCurrent();
    return $fn($n - 1) + $fn($n - 2);
};

echo $fibonacci(10); // Outputs: 55
?>

Voorbeeld: Comparison with traditional approach

Prior to PHP 8.5, implementing recursive closures required capturing a reference
to the closure variable using the  keyword:

use

<?php
// Traditional approach (still works in PHP 8.5)
$fibonacci = function (int $n) use (&$fibonacci) {
    if ($n === 0) return 0;
    if ($n === 1) return 1;
    return $fibonacci($n - 1) + $fibonacci($n - 2);
};

echo $fibonacci(10); // Outputs: 55
?>

The  approach eliminates the need to
declare the variable with a reference in the  clause,
making the code cleaner and less error-prone.

Closure::getCurrent``use