<breakfast_menu>
<food>
<name>Belgian Waffles</name>
<description>two of our famous Belgian Waffles with plenty of real maple syrup</description>
</food>
<food>
<name>Strawberry Belgian Waffles</name>
<description>light Belgian waffles covered with strawberries and whipped cream</description>
</food>
</breakfast_menu>
请问各位吧友大神，这个怎么用php只读第二行description的文本light开头的那一句。