PHP 7.2 compatibility

[lostincode]

Note: Explicitly passing NULL as the object is no longer allowed as of PHP 7.2.0. The parameter is still optional and calling get_class() without a parameter from inside a class will work, but passing NULL now emits an E_WARNING notice.

http://php.net/manual/en/function.get-class.php

[lostincode]

related - CodeSleeve/laravel-stapler#132

[iredmedia]

Any progress on this :)?

[michimawan]

facebook/hhvm#6954
sebastianbergmann/phpunit#3320

seems the build failed because of hhvm issues, should we disable hhvm checking?
sebastian bergman also mention that hhvm is not supported

[lostincode]

I think this repo is abandoned so I'm going to close my PR

[Alex-query]

i found a bad decidion use @ before $this->hasAttachedFile in __construct
// @$this->hasAttachedFile