Strings that are the same as function names are mistaken as callable

[elliotchance]

$this->assert($invoice, has_key, "Date");

Delivers the error:

Argument 2 (Date) must be int or string.

[coveralls]

Coverage remained the same when pulling 1fd1701 on 1.3.5/202-string-function-names into 2d78e1f on release/1.3.5.

[scrutinizer-notifier]

The inspection completed: No new issues