framework/di/Container.php
protected function build($class, $params, $config)
    {
        /* @var $reflection ReflectionClass */
        list($reflection, $dependencies) = $this->getDependencies($class);

        foreach ($params as $index => $param) {
            $dependencies[$index] = $param;
        }

        $dependencies = $this->resolveDependencies($dependencies, $reflection);
        if (!$reflection->isInstantiable()) {
            throw new NotInstantiableException($reflection->name);
        }
        if (empty($config)) {
            return $reflection->newInstanceArgs($dependencies);
        }

        $config = $this->resolveDependencies($config);

        if (!empty($dependencies) && $reflection->implementsInterface('yii\base\Configurable')) {
            // set $config as the last parameter (existing one will be overwritten)
            $dependencies[count($dependencies) - 1] = $config;
            return $reflection->newInstanceArgs($dependencies);
        }

        $object = $reflection->newInstanceArgs($dependencies);
        foreach ($config as $name => $value) {
            $object->$name = $value;
        }

        return $object;
    }
protected function build($class, $params, $config)
    {
        /* @var $reflection ReflectionClass */
        list($reflection, $dependencies) = $this->getDependencies($class);

        foreach ($params as $index => $param) {
            $dependencies[$index] = $param;
        }

        $dependencies = $this->resolveDependencies($dependencies, $reflection);
        if (!$reflection->isInstantiable()) {
            throw new NotInstantiableException($reflection->name);
        }
        if (empty($config)) {
            return $reflection->newInstanceArgs($dependencies);
        }

        $config = $this->resolveDependencies($config);

        if (!empty($dependencies) && $reflection->implementsInterface('yii\base\Configurable')) {
            // set $config as the last parameter (existing one will be overwritten)
            $dependencies[count($dependencies) - 1] = $config;
            return $reflection->newInstanceArgs($dependencies);
        }

        $object = $reflection->newInstanceArgs($dependencies);
        foreach ($config as $name => $value) {
            $object->$name = $value;
        }

        return $object;
    }
Creates an instance of the specified class.
This method will resolve dependencies of the specified class, instantiate them, and inject
them into the new instance of the specified class.
@param string $class the class name
@param array $params constructor parameters
@param array $config configurations to be applied to the new instance
@return object the newly created instance of the specified class
@throws NotInstantiableException If resolved to an abstract class or an interface (since 2.0.9)