请问个json解析有关问题

请教个json解析问题
我有几个json串

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-->{"clusterno":167145108,"clustertype":1,"subid":"0","newperson":"欢迎【.dazuo.昵称.dayou.】来到群【.dazuo.群名.dayou.】.enter.信息：.enter..dazuo.信息.dayou..enter..dazuo.退群次数.dayou..enter.请改群名片：帮派名┃职位 或者 帮派名┃职位┃昵称.enter.名称不符.douhao.不改名者送去夏威夷...enter..jhao..jhao..jhao..jhao..jhao..jhao..jhao..jhao..jhao..jhao..jhao..jhao..jhao..jhao..jhao..jhao..jhao..jhao..jhao..jhao..jhao..jhao..jhao..jhao..jhao..jhao..jhao..jhao..jhao..jhao..jhao..jhao..jhao..jhao..jhao..jhao..jhao..jhao..jhao..jhao..jhao..jhao..jhao..jhao..jhao..jhao..jhao..jhao..jhao..jhao..jhao..jhao..jhao..jhao..jhao..jhao..jhao..jhao..jhao..jhao..jhao..jhao..jhao..jhao..jhao..jhao..jhao..jhao..jhao..jhao..jhao..jhao..jhao..jhao..jhao..jhao..jhao..jhao..enter..douhao.是机器人.douhao.请直接无视忽略.","removeperson":"","expdatetime":"2021-10-18 23:50:42","userid":"1","username":"admin","updatecode":"7ECEDB4E1037476EAAF5FB5E8340AAEE"}

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<?php $json='{"clusterno":167145108,"clustertype":1,"subid":"0","newperson":"欢迎【.dazuo.昵称.dayou.】来到群【.dazuo.群名.dayou.】.enter.信息：.enter..dazuo.信息.dayou..enter..dazuo.退群次数.dayou..enter.请改群名片：帮派名┃职位 或者 帮派名┃职位┃昵称.enter.名称不符.douhao.不改名者送去夏威夷...enter..jhao..jhao..jhao..jhao..jhao..jhao..jhao..jhao..jhao..jhao..jhao..jhao..jhao..jhao..jhao..jhao..jhao..jhao..jhao..jhao..jhao..jhao..jhao..jhao..jhao..jhao..jhao..jhao..jhao..jhao..jhao..jhao..jhao..jhao..jhao..jhao..jhao..jhao..jhao..jhao..jhao..jhao..jhao..jhao..jhao..jhao..jhao..jhao..jhao..jhao..jhao..jhao..jhao..jhao..jhao..jhao..jhao..jhao..jhao..jhao..jhao..jhao..jhao..jhao..jhao..jhao..jhao..jhao..jhao..jhao..jhao..jhao..jhao..jhao..jhao..jhao..jhao..jhao..enter..douhao.是机器人.douhao.请直接无视忽略.","removeperson":"","expdatetime":"2021-10-18 23:50:42","userid":"1","username":"admin","updatecode":"7ECEDB4E1037476EAAF5FB5E8340AAEE"}';
$json=addcslashes($json,'\');
var_dump(json_decode(iconv('GBK','UTF-8',$json),true));
?><br><font color="#e78608">------解决方案--------------------</font><br>utf-8编码文件就不需要再  iconv了.参考楼上的.
<br><font color="#e78608">------解决方案--------------------</font><br>

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$json='{"clusterno":167145108,"clustertype":1,"subid":"0","newperson":"欢迎【.dazuo.昵称.dayou.】来到群【.dazuo.群名.dayou.】.enter.信息：.enter..dazuo.信息.dayou..enter..dazuo.退群次数.dayou..……