PHP count()函数讲解

<?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()); 
} 
? 

count();