在PHP中数组分为两类： 数字索引数组和关联数组。
其中数字索引数组和C语言中的数组一样，下标是为0，1，2…
而关联数组下标可能是任意类型，与其它语言中的hash，map等结构相似。

下面介绍PHP中遍历关联数组的三种方法：

方法1：foreach

复制代码 代码如下:
<?php
$sports = array(
"football" => "good",
"swimming" => "very well",
"running" => "not good");
foreach ($sports as $key => $value) {
echo $key.": ".$value."<br />";
?>

输出结果：

football: good
swimming: very well
running: not good

方法2：each

复制代码 代码如下:
<?php
$sports = array(
"football" => "good",
"swimming" => "very well",
"running" => "not good");
while ($elem = each($sports)) {
echo $elem["key"].": ".$elem["value"]."<br />";
?>


方法3：list & each
复制代码 代码如下:
<?php
$sports = array(
"football" => "good",
"swimming" => "very well",
"running" => "not good");
while (list($key, $value) = each($sports)) {
echo $key.": ".$value."<br />";
?>