The difference between Local Value (local variable) and Master Value (main variable) in
phpinfo() have two Column: Local Value and Master Value
1. Master Value is the content in the PHP.ini file.
2.Local value is the setting in the current directory. This value will overwrite the corresponding value in Master Value
Due to the settings of WEB Sever Config or .htaccess, or the settings of ini_set() in the program, the settings in the current directory will be different from the settings in the PHP.ini file
PS: The settings of php.ini can be overridden in the Apache configuration file, which may be in conf/httpd.conf or conf.d/***.conf, usually in conf.d/php.conf Medium