Replace (more specifically replace recursive)

[Matthew J. Sahagian]

I notice there's a merge() function, which of course is quite useful, although it doesn't look like it does so recursively. I'm wondering if there would be any support for adding a replace() function using PHP's array_replace() similarly.

Lastly, and most useful, I believe, mergeRecursive() and replaceRecursive().

[Mark Armendariz]

I've been using the version from this PR for mergeRecursive and mergeRecursiveDistinct, which both work great, and I'm hoping will be accepted at some point.

#3

[Riku Särkinen]

PR for mergeRecursive and mergeRecursiveDistinct methods is now merged and also replacemethod is added.