Online PHP editor | refs for W9DZM

<?php class Context { private $context = null; private $data = []; public function __construct(Context $context = null) { $this->context = $context; } public function get($name) { if (isset($this->data[$name])) { return $this->data[$name]; } if (isset($this->context)) { return $this->context->get($name); } return null; } public function getAll() { return $this->data; } public function set($name, $value) { $this->data[$name] = $value; } public function wrap() { return new Context($this); } public function call(callable $function) { call_user_func($function, $this); } } (new Context)->call(function(Context $c) { $c->set('foo', 1); $c->set('bar', 2); $c->wrap()->call(function(Context $c) { $c->set('bar', 3); $c->set('qux', 4); $c->wrap()->call(function(Context $c) { $c->set('qux', 5); $c->set('zip', 6); var_dump($c); }); var_dump($c); }); var_dump($c); });