Background Run-time analysis are an important part of software development. Specially when you are writing scalable software, it is beneficial to know how your program scales with increasing input. This information allows you to determine the limits of your program, and its always good to know your limits. Run-time analysis is…

TL;DR The PHP implementation of array_uintersect (or more truthfully, any array_intersect variant) does the following: Uses the comparison function (if passed) to sort all the arrays Copies the first array into the return value Searches for individual values from the first array in all the subsequent arrays until it finds…