Well, this was what I thought when I was first introduced to PHP. Almost every library function seemed to have a duplicate. But my title itself is wrong. They are not at all identical.
Take for instance
1) str_replace() and preg_replace()
2) join() and implode()
3) split(), preg_split() and explode()
One of the basic nightmares of a web developer is optimizing queries. Every now and then, I keep seeing articles which advise lesser queries per web page, normalised tables, indexes on the most queried columns and a diligent logic.
Ofcourse, this is what is needed. But at the same time, not everyone is exposed to better optimization techniques. If you are one of those, who have written a perfect SQL but still wondering why it takes that longer for it to get executed, read on.
I see that there is not much documentation for this above error. This is probably a configuration problem and can be easily corrected.
Warning: session_destroy(): Session object destruction failed