$hdmc='[{"id":"radios","type":"radios","name":"单选","params":{"title":"赠品","value":"大米一袋","explain":"","required":true},"style":{},"data":[{"name":"身爱之物玻色因奢护十件套"},{"name":"大米一袋"},{"name":"小米一袋"},{"name":"石油一同"}],"_sortId":"1667279616767_0.36685411348863206"},{"id":"singlelinetext","type":"singlelinetext","name":"单行文本","params":{"title":"请输入领取员工工号（可向店员获取）","value":"1831","explain":"","required":true,"tip":"数字工号"},"style":{},"data":[],"_sortId":"1667279260378_0.04160550388526385"}]';
如何才能取到params 中 title 赠品 value == 大米一袋
还有下面的params":{"title":"请输入领取员工工号（可向店员获取）","value":"1831", 中 的value==1831
这个是一个表单提交的内容，选中的是大米一袋。
用json_decode生成对象数组，获取数组项对象的属性
<?php
$hdmc='[{"id":"radios","type":"radios","name":"单选","params":{"title":"赠品","value":"大米一袋","explain":"","required":true},"style":{},"data":[{"name":"身爱之物玻色因奢护十件套"},{"name":"大米一袋"},{"name":"小米一袋"},{"name":"石油一同"}],"_sortId":"1667279616767_0.36685411348863206"},{"id":"singlelinetext","type":"singlelinetext","name":"单行文本","params":{"title":"请输入领取员工工号（可向店员获取）","value":"1831","explain":"","required":true,"tip":"数字工号"},"style":{},"data":[],"_sortId":"1667279260378_0.04160550388526385"}]';
$obj=json_decode($hdmc);
echo $obj[0]->params->value.'<br>';
echo $obj[1]->params->value;