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A PHP Error was encountered

Severity: Notice

Message: Undefined index: userid

Filename: views/question.php

Line Number: 191

Backtrace:

File: /var/www/html/cnasolution/application/views/question.php
Line: 191
Function: _error_handler

File: /var/www/html/cnasolution/application/controllers/Questions.php
Line: 419
Function: view

File: /var/www/html/cnasolution/index.php
Line: 315
Function: require_once

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What is this usage of =>? [duplicate]

When I have Visual Studio 2017 generate properties for me, it will always use the new expression-bodied properties, for example:

private static string username; internal static string Username { get => username; set => username = value; } 

Is there any advantage of using this style over the following or is it just a matter of preference and readability?

internal static string Username { get; set; } 
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