Stub for fluent interface

fluent_stub.php

<?php

class Stub
{
    private array $stubMethods = [];

    public function stubMethodChain(array $chain, \Closure $callback): void
    {
        if (count($chain) === 0) {
            return;
        }

        if (count($chain) === 1) {
            $this->stubMethods[$chain[0]] = $callback;
            return;
        }

        $this->stubMethods[$chain[0]] = function () use ($chain, $callback) {
            $clone = clone $this;
            $clone->stub(array_slice($chain, 1), $callback);
            return $clone;
        };
    }

    public function __call(string $name, array $arguments)
    {
        return $this->stubMethods[$name]();
    }
}

$days = ['Monday'];
$stub = new Stub();
$stub->stubMethodChain(['days', 'active', 'get', 'load'], fn () => $days);

// returns ['Monday']
$stub->days()->active()->get()->load();