is clientId and clientSecret is same appKey and appSecret

I'm just wondering is clientId and clientSecret is same as appKey and appSecret. if so is any specific reason we have to set both. Thanks

https://github.com/ringcentral/ringcentral-php

return array(

'username' => '15xx53xx1', // your RingCentral account phone number

'extension' => '101', // or number

'password' => 'dsfXGfMdsfTdxsdfd',

'clientId' => 'sdfdst93w',

'clientSecret' => 'Vp7N7TwDsdfdsFbIuTaSINT84wNCWbODRQ',

'server' => 'https://platform.devtest.ringcentral.com', // for production - https://platform.ringcentral.com

'smsNumber' => '1800xxxx095', // any of SMS-enabled numbers on your RingCentral account

'mobileNumber' => '146xxx76', // your own mobile number to which script will send sms

'dateFrom' => '2018-07-10', // dateFrom

'dateTo' => '2018-07-12', // dateTo

'appKey' => 'sdfdst93w',

'appSecret' => 'Vp7N7TwDsdfdsFbIuTaSINT84wNCWbODRQ',

);

Those are not real