src/SimpleDOM.php
public function xpathValue($strXpathQuery)
    {

        $objResult = $this->xpathSingle($strXpathQuery);

        if ($objResult === false) {
            return false;
        } elseif ($objResult === null) {
            return null;
        } else {
            return (string)$objResult;
        }
    }
public function xpathValue($strXpathQuery)
    {

        $objResult = $this->xpathSingle($strXpathQuery);

        if ($objResult === false) {
            return false;
        } elseif ($objResult === null) {
            return null;
        } else {
            return (string)$objResult;
        }
    }
Get a nodevalue from an xpath query returning only one node (single)

@param string $strXpathQuery
@return static the returning element, NULL if not found, FALSE on error