CodeIgniter文件上传错误：escapeshellarg() has been disabl

CodeIgniter文件上传错误：escapeshellarg() has been disabled for security reasons

原因：escapeshellarg函数被禁止

解决方法：

1、修改PHP配置文件php.ini，找到 disable_functions 字段，删除 escapeshellarg 。

2、重启php-fpm（nginx环境）。

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