PHP count() 函数

实例

计算 car 节点的子节点个数：

<?php
$xml=<<<XML
 <cars>
 <car name="Volvo">
 <child/>
 <child/>
 <child/>
 <child/>
 </car>
 <car name="BMW">
 <child/>
 <child/>
 </car>
</cars>
XML;

$elem=new SimpleXMLElement($xml);
foreach ($elem as $car)
 {
 printf("%s has %d children.<br>", $car['name'], $car->count());
 }
?>

Volvo has 4 children.
BMW has 2 children.