Returns the currently executing closure

# Closure::getCurrent

(PHP 8 >= 8.5.0)

Closure::getCurrent — Returns the currently executing closure

### Description

public static Closure::getCurrent(): Closure

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 `use` keyword.

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.`

### Parameters

This function has no parameters.

### Return Values

Returns the currently executing Closure instance.

### Errors/Exceptions

Throws an Error if called outside of a closure context.

### Examples

Example #1 Closure::getCurrent() example

Using Closure::getCurrent() to implement a recursive Fibonacci function:

`<?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
?>`

Example #2 Comparison with traditional approach

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

`<?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 Closure::getCurrent() approach eliminates the need to declare the variable with a reference in the `use` clause, making the code cleaner and less error-prone.

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