PHP reflection mechanism explained

PHP 5 features a complete reflection API, adding the ability to reverse engineer classes, interfaces, functions, methods, and extensions. Additionally, the Reflection API provides methods to extract documentation comments from functions, classes, and methods.

The use of reflection in the tp framework:

• ReflectionClass::__construct — Construct a ReflectionClass class

public ReflectionClass::__construct ( mixed $argument )

• ReflectionClass::newInstanceArgs — Creates a new class instance from the given arguments, which are passed to the class's constructor.

public object ReflectionClass::newInstanceArgs ([ array $args ] )

• /thinkphp/library/think/Container.php

 /**
     * 调用反射执行类的实例化 支持依赖注入
     * @access public
     * @param  string    $class 类名
     * @param  array     $vars  参数
     * @return mixed
     */
    public function invokeClass($class, $vars = [])
    {
        try {            $reflect = new ReflectionClass($class);            $constructor = $reflect->getConstructor();            //用于支持依赖的注入
            $args = $constructor ? $this->bindParams($constructor, $vars) : [];            return $reflect->newInstanceArgs($args);
        } catch (ReflectionException $e) {            throw new ClassNotFoundException('class not exists: ' . $class, $class);
        }
    }

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