PHP 数组函数 each()

<?php
   $transport = array('foot', 'bike', 'car', 'plane');
   $key_value = each($transport);

   print_r($key_value);
   print "<br />";

   $key_value = each($transport);
   print_r($key_value);
   print "<br />";

   $key_value = each($transport);
   print_r($key_value);
?>