src/URI.php
public function getQueryValue($key)
	{
		return isset($this->query[$key]) ? $this->query[$key] : null;
	}
public function getQueryValue($key)
	{
		return isset($this->query[$key]) ? $this->query[$key] : null;
	}
Returns the value to which the specified key is mapped, or null if the query map contains no mapping for the key.

@param string $key
@return string the value to which the specified key is mapped, or null if the query map contains no mapping for the key.