thinkphp URL Compatibility mode issues

URL is such a http://192.168.6.227/index.php?s=Admin/Api/loginVerify/a/b, I in action to get parameter A, in this way $_request[' a '] get not, Excuse me, what's going on?

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URL is such a http://192.168.6.227/index.php?s=Admin/Api/loginVerify/a/b, I in action to get parameter A, in this way $_request[' a '] get not, Excuse me, what's going on?

The M, C, a three parameters represent the module, controller, and action, so the other parameter names passed are not used with these

I (' get.a ')

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