<?php
// 格式: 【二维数组】
Array
(
[0] => Array
(
[topicid] => 1
)
[1] => Array
(
[topicid] => 2
)
[2] => Array
(
[topicid] => 6
)
)
//方法一:
$topicid = ' '; //变量赋值为空
//用foreach 遍历下二维数组
foreach($arrs as $key=>$vals){
$topicid.=$vals['topicid'].',';
}
// 使用 rtrim() 函数从字符串右端删除字符:
$topicid = rtrim($topicid, ',');
echo $topicid;
//====================================
结果: 1,2,6
// 方法二:
foreach($ProTopicid as $valueId){
$string = '';
foreach($valueId as $v){
$string.= rtrim($v.',');
}
}
sophia_yu