PHP 数组current和next用法

1.current   当前数组

<?php
 $transport = array('foot', 'bike', 'car', 'plane');
 $mode =
current($transport); //$mode = 'foot';
 $mode = next($transport);   // $mode
='bike';
 $mode = current($transport); //$mode = 'bike';
 $mode =
prev($transport);   // $mode ='foot';
 $mode = end($transport);    // $mode
='plane';
 $mode = current($transport); //$mode = 'plane';
 ?>

2.next  下一个数组

<?php
 $transport = array('foot', 'bike', 'car', 'plane');
 $mode =
current($transport); //$mode = 'foot';
 $mode = next($transport);   // $mode
='bike';
 $mode = next($transport);   // $mode ='car';
 $mode =
prev($transport);   // $mode ='bike';
 $mode = end($transport);    // $mode
='plane';
 ?>