False positive on a prefixed function

[Theme sniffer](https://github.com/WPTRT/theme-sniffer) plugin uses PHPCompatiblity to check if the theme is compatible with certain versions of php.

We got an issue where a custom made function that's called `family_grows_entry_posted_on_setup()` triggers error

```sh
Extension 'fam' is removed since PHP 5.1
```

The `family` part gives a false positive.

Can this be fixed? 

Thanks.