PHP each()与list()函数

<?php

$info = array('coffee', 'brown', 'caffeine');

// Listing all the variables
list($drink, $color, $power) = $info;
echo "$drink is $color and $power makes it special.n";

// Listing some of them
list($drink, , $power) = $info;
echo "$drink has $power.n";

// Or let's skip to only the third one
list( , , $power) = $info;
echo "I need $power!n";

// list() doesn't work with strings
list($bar) = "abcde";
var_dump($bar); // NULL
?>

<?
$people = array("Peter", "Joe", "Glenn", "Cleveland");
print_r (each($people));
?>

<?php
$cities=array("California"=>array("Martinez","San Francisco","Los Angeles"),
              "New York"=>array("New York","Buffalo")
            );
while (list($key,$value)=each($cities))
{    //echo $key;
//echo "fdash";
//echo
while (list($key0,$val)=each($value)){
echo "elements:$key0,value:$val<br>n";
}
}
?>