HELP NEEDED: recreating the cause of Travis' current test failures

@sv3tli0 - that pointed me in the right direction, thanks! Fixed that error, though I now have another to rewrite with due to to PHP 7's not guaranteeing array ordering. Not that I'm complaining - I'm very thankful I didn't have to write the foreign key code for Forge, so I'll gladly refactor the contributor's test

Specially for arrays I think that one array helper will always be useful, at core and at app development there are often shits happening when someone wants to order or merge multidimensional arrays..
Maybe we can think for such helper, with defined several useful array functions. As ordering (by key / value), merging (deep merging),  check for keys or values existing and other functions.

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