請問個json解析有關問題

請教個json解析問題
我有幾個json串

HTML code

{"clusterno":167145108,"clustertype":1,"subid":"0","newperson":"歡迎【.dazuo.暱稱.dayou.】來到群【.dazuo.群名.dayou.】.enter.資訊：.enter..dazuo.資訊.dayou..enter..dazuo.退群次數.dayou..enter.請改群名片：幫派名┃職位 或者 幫派名┃職位┃暱稱.enter.名稱不符.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.\是機器人.douhao.請直接無視忽略.","removeperson":"","expdatetime":"2021-10-18 23:50:42","userid":"1","username":"admin","updatecode":"7ECEDB4E1037476EAAF5FB5E8340AAEE"}

用json_decode解析會出現是null的.

我測試了 一下,是newperson這個接點太長導致的,有沒有什麼方法可以解決這個問題

------解決方案--------------------
反斜線轉義，轉換編碼

PHP code

------解決方案--------------------
utf-8編碼檔案就不需要再  iconv了.參考樓上的.
------解決方案--------------------
探討

反斜線轉義，轉換編碼
PHP code
$json='{"clusterno":167145108,"clustertype":1,"subid":"0","newperson":"歡迎【.dazuo.暱稱.dayou.】來到群【.dazuo.群名.dayou.】.enter.資訊：.enter..dazuo.資訊.dayou..enter..dazuo.退群次數.dayou..……
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