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帮忙分析一下 php函数

<?php
preg_match_all("|<div id=\"mostOfferQuestion\".*>(.*)</div>|isU",$body,$zuiguanzhu);
preg_match_all("|• <a href=\"/z/q(.*).htm\" target=\"_blank\">(.*)</a> \[<a href=\"/z/c(.*).htm\" class=\"sliver\">(.*)</a>\]</li>|isU",$zuiguanzhu[1][0],$zuiguanzhuliebiao);
foreach ($zuiguanzhuliebiao[2] as $key => $values){
?>

 

请解释一下这行代码的含义

foreach ($zuiguanzhuliebiao[2] as $key => $values){

追问:$key => $values 这个是什么意思?
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