system/HTTP/URI.php
protected function splitQueryPart(string $part)
	{
		$parts = explode('=', $part, 2);

		// If there's only a single element, no pair,
		// then we return null
		if (count($parts) === 1)
		{
			$parts = null;
		}

		return $parts;
	}
protected function splitQueryPart(string $part)
	{
		$parts = explode('=', $part, 2);

		// If there's only a single element, no pair,
		// then we return null
		if (count($parts) === 1)
		{
			$parts = null;
		}

		return $parts;
	}
Split a query value into it's key/value elements, if both
are present.

@param $part

@return array|null