@param $name

@return mixed|null
195560
public function registered($name)
    {
        if ($this->provider->hasSingleton($name)) {
            return $this->provider->singleton($name);
        }

        if ($this->provider->hasProvider($name)) {
            return $this->provider->getProvider($name);
        }

        return null;
    }
758647
public function getParameter($name): ?Parameter
    {
        /** @var Parameter $parameter */
        foreach ($this->parameters as $parameter) {
            if ($parameter->getKey() === $name) {
                return $parameter;
            }
        }

        return null;
    }
145210
public function getParam($name)
    {
        if ( ! is_string($name) || ! isset($this->data[$name])) {
            return null;
        }

        return $this->data[$name];
    }
167144
public function getParameterValue($name)
    {
        return (isset($this->attributes[$name])) ? $this->attributes[$name] : null;
    }
1216834
public function get($name)
    {
        if ($this->argument->defined($name)) {
            return $this->argument->get($name);
        }
        return null;
    }
1141060
public function get($name) {

		if ( array_key_exists( $name, $this->_properties )) {
			return $this->_properties[$name];

		} else if ( isset($this->$name) ) {
			return $this->$name;
		}

		return null;
	}
556050
public function getArgument($name)
    {
        if (isset($this->arguments[$name])) {
            return $this->arguments[$name];
        }
        return null;
    }
543729
public function get($name)
    {
        $config = $this->all;
        return isset($config[$name]) ? $config[$name] : null;
    }
1053378
public function &__get($name)
    {
        if(!isset($this->arguments[$name]))
            return null;
        
        return $this->arguments[$name];
    }
58289
public function getParameter($name)
    {
        $key = strtolower($name);

        if (isset($this->parameters[$key])) {
            return $this->parameters[$key];
        }

        return null;
    }
1363871
public function get($name) {
        $query = $this->queryAll();
        return isset($query[$name]) ? $query[$name] : null;
    }
1276103
public function getRequestHeader($name)
    {
        return (isset($this->requestHeaders[$name])) ? $this->requestHeaders[$name] : null;
    }
286451
public function get(string $name): ?string
    {
        $key = strtolower($name);
        if (!isset($this->headers[$key])) {
            return null;
        }

        return $this->headers[$key][1];
    }
1239426
public function getDrupalParameter($name)
    {
        return isset($this->drupalParameters[$name]) ? $this->drupalParameters[$name] : null;
    }
821688
public function findRequest(string $name)
    {
        foreach ($this->actions as $action) {
            if ($action->getRequest()->getName() === $name) {
                return $action->getRequest();
            }
        }

        return null;
    }
52734
public static function get($name)
	{
		return isset(self::$configParams[$name])
			? self::$configParams[$name]
			: null;
	}
279109
public function getParameter($name)
    {
        if (isset($this->_parameters[$name])) {
            return $this->_parameters[$name];
        }
        return null;
    }