@ symbol in PHP

What are the advantages of using $exists = @$userID; statement, compared to the longer notation of if(isset($userID)){$exists = $userID; }else{$exists = false;} if(isset($userID)){$exists = $userID; }else{$exists = false;}

Is the "@" notation a lot faster, because I find it less readable ?

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显然，在谷歌搜索5秒后，它抑制了错误报告。

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