php数组函数，遍历数组的几种方法？

介绍三种。// for、 foreach、 each and list// for 循环方式遍历数组，仅可遍历索引数组$ary = ['hello', 'world'];for ($key = 0; $key < count($ary); $key ++) { echo $key . $ary[$key];}// foreach 专门用来遍历数组的语言结构foreach ($ary AS $key => $value) { echo $key . $value;}// each 配合 list 循环遍历while (list($key, $value) = each($ary)) { echo $key . $value;}