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<?php /** * Container main class. * * @author Fabien Potencier */ class Container implements \ArrayAccess { private $values = array(); private $factories; private $protected; private $frozen = array(); private $raw = array(); private $keys = array(); /** * Instantiate the container. * * Objects and parameters can be passed as argument to the constructor. * * @param array $values The parameters or objects. */ public function __construct(array $values = array()) { $this->factories = new \SplObjectStorage(); $this->protected = new \SplObjectStorage(); foreach ($values as $key => $value) { $this->offsetSet($key, $value); } } /** * Sets a parameter or an object. * * Objects must be defined as Closures. * * Allowing any PHP callable leads to difficult to debug problems * as function names (strings) are callable (creating a function with * the same name as an existing parameter would break your container). * * @param string $id The unique identifier for the parameter or object * @param mixed $value The value of the parameter or a closure to define an object * @throws \RuntimeException Prevent override of a frozen service */ public function offsetSet($id, $value) { if (isset($this->frozen[$id])) { throw new \RuntimeException(sprintf('Cannot override frozen service "%s".', $id)); } $this->values[$id] = $value; $this->keys[$id] = true; } /** * Gets a parameter or an object. * * @param string $id The unique identifier for the parameter or object * * @return mixed The value of the parameter or an object * * @throws \InvalidArgumentException if the identifier is not defined */ public function offsetGet($id) { if (!isset($this->keys[$id])) { throw new \InvalidArgumentException(sprintf('Identifier "%s" is not defined.', $id)); } if ( isset($this->raw[$id]) || !is_object($this->values[$id]) || isset($this->protected[$this->values[$id]]) || !method_exists($this->values[$id], '__invoke') ) { var_dump('values'); return $this->values[$id]; } if (isset($this->factories[$this->values[$id]])) { var_dump('factories'); return $this->values[$id]($this); } var_dump('else'); $this->frozen[$id] = true; $this->raw[$id] = $this->values[$id]; return $this->values[$id] = $this->values[$id]($this); } /** * Checks if a parameter or an object is set. * * @param string $id The unique identifier for the parameter or object * * @return bool */ public function offsetExists($id) { return isset($this->keys[$id]); } /** * Unsets a parameter or an object. * * @param string $id The unique identifier for the parameter or object */ public function offsetUnset($id) { if (isset($this->keys[$id])) { if (is_object($this->values[$id])) { unset($this->factories[$this->values[$id]], $this->protected[$this->values[$id]]); } unset($this->values[$id], $this->frozen[$id], $this->raw[$id], $this->keys[$id]); } } /** * Marks a callable as being a factory service. * * @param callable $callable A service definition to be used as a factory * * @return callable The passed callable * * @throws \InvalidArgumentException Service definition has to be a closure of an invokable object */ public function factory($callable) { if (!is_object($callable) || !method_exists($callable, '__invoke')) { throw new \InvalidArgumentException('Service definition is not a Closure or invokable object.'); } $this->factories->attach($callable); return $callable; } /** * Protects a callable from being interpreted as a service. * * This is useful when you want to store a callable as a parameter. * * @param callable $callable A callable to protect from being evaluated * * @return callable The passed callable * * @throws \InvalidArgumentException Service definition has to be a closure of an invokable object */ public function protect($callable) { if (!is_object($callable) || !method_exists($callable, '__invoke')) { throw new \InvalidArgumentException('Callable is not a Closure or invokable object.'); } $this->protected->attach($callable); return $callable; } /** * Gets a parameter or the closure defining an object. * * @param string $id The unique identifier for the parameter or object * * @return mixed The value of the parameter or the closure defining an object * * @throws \InvalidArgumentException if the identifier is not defined */ public function raw($id) { if (!isset($this->keys[$id])) { throw new \InvalidArgumentException(sprintf('Identifier "%s" is not defined.', $id)); } if (isset($this->raw[$id])) { return $this->raw[$id]; } return $this->values[$id]; } /** * Extends an object definition. * * Useful when you want to extend an existing object definition, * without necessarily loading that object. * * @param string $id The unique identifier for the object * @param callable $callable A service definition to extend the original * * @return callable The wrapped callable * * @throws \InvalidArgumentException if the identifier is not defined or not a service definition */ public function extend($id, $callable) { if (!isset($this->keys[$id])) { throw new \InvalidArgumentException(sprintf('Identifier "%s" is not defined.', $id)); } if (!is_object($this->values[$id]) || !method_exists($this->values[$id], '__invoke')) { throw new \InvalidArgumentException(sprintf('Identifier "%s" does not contain an object definition.', $id)); } if (!is_object($callable) || !method_exists($callable, '__invoke')) { throw new \InvalidArgumentException('Extension service definition is not a Closure or invokable object.'); } $factory = $this->values[$id]; $extended = function ($c) use ($callable, $factory) { return $callable($factory($c), $c); }; if (isset($this->factories[$factory])) { $this->factories->detach($factory); $this->factories->attach($extended); } return $this[$id] = $extended; } /** * Returns all defined value names. * * @return array An array of value names */ public function keys() { return array_keys($this->values); } /** * Registers a service provider. * * @param ServiceProviderInterface $provider A ServiceProviderInterface instance * @param array $values An array of values that customizes the provider * * @return static */ public function register(ServiceProviderInterface $provider, array $values = array()) { $provider->register($this); foreach ($values as $key => $value) { $this[$key] = $value; } return $this; } } $container = new Container(); $foo = new \StdClass(); $foo->bar = 'fiz'; $container['foo'] = $foo; var_dump($container['foo']);
Output for 5.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
string(6) "values" object(stdClass)#4 (1) { ["bar"]=> string(3) "fiz" }