PHP has a large number of functions one of which commonly used is array_merge. It basically merges 'n' number of arrays. We have used it quite often in my code and found out that it does not preserve keys when moved from 32-bit architecture to 64-bit. Let's figure out why this happened ? Recently We moved our ubuntu servers from 32-bit to 64-bit. Then suddenly some of arrays started losing their indexes which were working on previous server. Then we figured out it was an issue with array_merge. Code was using big numbers as indexes in multiple arrays which needs to be merged. Here... Read More