src/SimpleDOM.php
public function innerXML()
    {
        $xml = $this->outerXML();
        $pos = 1 + strpos($xml, '>');
        $len = strrpos($xml, '<') - $pos;
        return substr($xml, $pos, $len);
    }
public function innerXML()
    {
        $xml = $this->outerXML();
        $pos = 1 + strpos($xml, '>');
        $len = strrpos($xml, '<') - $pos;
        return substr($xml, $pos, $len);
    }
Return the XML content of current node as a string

@return    string            Content of current node