src/web/ErrorHandler.php
protected function getTypeUrl($class, $method)
    {
        if (strpos($class, 'yii\\') !== 0) {
            return null;
        }

        $page = $this->htmlEncode(strtolower(str_replace('\\', '-', $class)));
        $url = "http://www.yiiframework.com/doc-2.0/$page.html";
        if ($method) {
            $url .= "#$method()-detail";
        }

        return $url;
    }
protected function getTypeUrl($class, $method)
    {
        if (strpos($class, 'yii\\') !== 0) {
            return null;
        }

        $page = $this->htmlEncode(strtolower(str_replace('\\', '-', $class)));
        $url = "http://www.yiiframework.com/doc-2.0/$page.html";
        if ($method) {
            $url .= "#$method()-detail";
        }

        return $url;
    }
Returns the informational link URL for a given PHP type/class.
@param string $class the type or class name.
@param string|null $method the method name.
@return string|null the informational link URL.
@see addTypeLinks()