<input type="hidden" name="msginfo[name][]" value="张三"/>
<input type="hidden" name="msginfo[phonenum][]" value="111111111"/>
<input type="hidden" name="msginfo[name][]" value="李四"/>
<input type="hidden" name="msginfo[phonenum][]" value="222222222"/>

<?php 
 $msgInfos = $_POST['msginfo'];
 $phoneNums = $msgInfos['name']; // 为array（-=>张三，1=>李四）
 $phoneNums = $msgInfos['phonenum']; // 为array(0=>111111111，1=>222222222)

<?php
if(isset($_POST['submit'])){
$users = $_POST['user'];
foreach($users as $key=>$val){
  echo 'user ',$key,' = ',$val,'<br />';
}
}
?>
<form method="post">
zhangsan <input type="text" name="user[zhangsan]" value="0" /><br />
lisi <input type="text" name="user[lisi]" value="1" /><br />
wangwu <input type="text" name="user[wangwu]" value="2" /><br />
zhaoliu <input type="text" name="user[zhaoliu]" value="3" /><br />
<input type="submit" name="submit" value="提交" />
</form>

<form method="post">
<?
for($i=0;$i<10;$i++){
?>
<input type="checkbox" name="interests[]" value="<?=$i?>">test<?=$i?><br>
<?
}
?>
<input type="submit">
</form>

<?php
<code class="php keyword">if(isset($_POST)){
 foreach($_POST as $key => $val){
  if(is_array($val)){
    foreach($val as $v2){
    echo "$v2<br>";
    }
  }
 }
}
?>
</code>