Scan entire XML file and grab only nodes needed

please ignore the semantics of the XML data. I want to scan the whole xml file and grab only banana values and store them as an array in PHP.

<?xml version="1.0" encoding="UTF-8" ?>
<data>
<fruits>
    <fruit id="1" >
        <aisle1>
            <apple>aa</apple>
            <banana>ab</banana>
            <cherry>ac</cherry>
            <damson>ad</damson>
        </aisle1>
        <aisle2>
            <apple>none</apple>
            <banana>3708650582321691833</banana>
            <cherry>none</cherry>
            <damson>none</damson>
        </aisle2>
        <aisle3>
            <apple>none</apple>
            <banana>3708650582321691833</banana>
            <cherry>none</cherry>
            <damson>none</damson>
        </aisle3>
    </fruit>
    <fruit id="2" >
        <aisle1>
            <apple>none</apple>
            <banana>3708650582321691833</banana>
            <cherry>none</cherry>
            <damson>none</damson>
        </aisle1>
        <aisle2>
            <apple>none</apple>
            <banana>3708650582321691833</banana>
            <cherry>none</cherry>
            <damson>none</damson>
        </aisle2>
        <aisle3>
            <apple>none</apple>
            <banana>3708650582321691833</banana>
            <cherry>none</cherry>
            <damson>none</damson>
        </aisle3>
    </fruit>
</fruits>

Can xPath allow me to do this? I currently have:

$xml->xpath("//fruits//fruit//bananas->text()";

Thanks.