NetBeans：在laravel 5.2中给出语法错误

Question

Following is the snippet of code from Kernel.php in laravel.

 protected $middleware = [
            \Illuminate\Foundation\Http\Middleware\CheckForMaintenanceMode::class,
        ];

Netbeans says

Syntax error
     unexpected:    class
     after: ::
     expected:  identifier

POSSIBLE Syntax Error (check preceding valid syntax error)
 unexpected:

What's going on ? underline on whole line is irritating me.

Answer 1

ClassName::class是一项新功能，右键单击Project Node并将php版本更改为5.5或更高版本。

Answer 2

Maybe You should change your project properties. Maybe When you created project you choose PHP version lower than 5.5. Code ClassName::class; is new feature PHP 5.5