<?php
$data = array(
    array("post_id"=>1,"title"=>"如何学好PHP","reply_num"=>582),
    array("post_id"=>2,"title"=>"HPH数组常用函数汇总","reply_num"=>182),
    array("post_id"=>3,"title"=>"PHP字符串常用函数汇总","reply_num"=>982)
);
foreach ($data as $kk=>$vv){
    $values[$kk]= isset($vv["reply_num"])? $vv["reply_num"]:" ";
    $a = "wozainali";
}
print_r($values);
echo $a;
?>

输出结果：
Array ( [0] => 582 [1] => 182 [2] => 982 ) wozainali

我在foreach函数中定义了局部变量$values和$a,为什么在函数外还可以访问？？？？？？？？