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Informations about the package recursor

Recursor

Recursor enabled execution of recursive algorithms in an iterative manner by utiliting PHP's generator feature. This is particularly useful, because there may be algorithms that are easy to implement recursively but hard iteratively. Also, PHP imposes an artificial nesting limit on recursion.

To transform a recursive function into a quasi-recursive one using Recursor, basically the only work that is needed is to replace return keywords with yield and recusrive function calls should also be prefixed with yield.

An example that will generate the nth Fibonacci-number:

$fibonacci = function ($x) use (&$fibonacci) {
    if ($x === 0) {
        yield 0;
    } else if ($x === 1) {
        yield 1;
    } else {
        $x1 = (yield $fibonacci($x - 1));   //retrieves return value of recursive call
        $x2 = (yield $fibonacci($x - 2));
        yield $x1 + $x2;                    //yielding a non-generator acts as a return
    }
};

$wrapped = new Recursor($fibonacci);

$wrapped(5); // returns 5
$wrapped(6); // returns 8

Notes

Downsides

Recursor relies heavily on generators. Each recursive call instantiates and executes a generator, which has a certain CPU and memory overhead. Also, the actual executor function is quite complicated which imposes even more overhead. Because of this, relying on Recurson in performance-sensitive applications is not recommended and an iterative solution should be implemented.

All versions of recursor with dependencies

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Package Version
Requires php Version >=7.0
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