DZ安装插件报错：Cannot use string offset as an array

discuz3.4安装插件报错：Cannot use string offset as an array

环境：PHP7.1以上

解决办法：

文件source/function/function_plugin.php

搜索：foreach($vars as $key => $var) {

后面插入代码

 if(!$_G['cache']['pluginlanguage_system'])
 $_G['cache']['pluginlanguage_system']=array();

提交到gitee:https://gitee.com/apoyl/DiscuzX/commit/73ebcc8c05fed33294be06aaceede7dcd94dfae6

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