AwesomePHP dependency injection container pimple

The Dependency Injection container pimple Dependency Injection (Dependency Injection) in awesomePHP is also called Inversion of Control (Inversion of Control). It is an important object-oriented programming law to reduce the coupling problem of computer programs, it can eliminate the direct dependency between components, make component development more independent, use more flexible, and is widely used in the java framework. In php, java cannot be completely copied due to language features, but simple functions can still be implemented. Pimple is a popular ioc container in the php community.

You can use composer to add require "pimple/pimple": "1 .*"

The advantage of pimple is that it is simple, just a file

 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')        ) {            return $this->values[$id];        }        if (isset($this->factories[$this->values[$id]])) {            return $this->values[$id]($this);        }        $this->frozen[$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 $id The unique identifier for the parameter or object     *     * @return Boolean     */    public function offsetExists($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);    }}

The pimple class inherits a php array object interface. during the entire life cycle of a program, various attributes, methods, objects, and closures can be registered. This makes it easy to implement the hashtable php array, the query efficiency of the container itself is not too low. Similar to Zend_Register in zf1 or Yii, pimple is more intuitive in general.

Pimple only implements the concept of a container. for the function of dependency injection to automatically create correlated objects, refer to the implementation in Laravel4 and Z2. Example code:

require __DIR__ . '/vendor/autoload.php';  // define some services$container['session_storage'] = function ($c) {    return new $c['session_storage_class']($c['cookie_name']);};$container['session'] = function ($c) {    return new Session($c['session_storage']);};// get the session object$session = $container['session'];$container['session'] = $container->factory(function ($c) {    return new Session($c['session_storage']);});