src/SleepingOwl/Apist/Selectors/ApistSelector.php
public function getValue(ApistMethod $method, Crawler $rootNode = null)
	{
		if (is_null($rootNode))
		{
			$rootNode = $method->getCrawler();
		}
		$result = $rootNode->filter($this->selector);
		return $this->applyResultCallbackChain($result, $method);
	}
public function getValue(ApistMethod $method, Crawler $rootNode = null)
	{
		if (is_null($rootNode))
		{
			$rootNode = $method->getCrawler();
		}
		$result = $rootNode->filter($this->selector);
		return $this->applyResultCallbackChain($result, $method);
	}
Get value from content by css selector

@param ApistMethod $method
@param Crawler $rootNode
@return array|null|string|Crawler