getcurrent
Closure::getCurrent
Returns the currently executing closure
ENTITY
public
static
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 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.
ENTITY ENTITY
ENTITY
Returns the currently executing Closure instance.
ENTITY
Throws an Error if called outside of a closure context.
ENTITY
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
?>
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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