Remove all array elements except what I want?

Question

I have controller that takes post parameters from HTML form, it will then send them to model that will insert the array into Cassandra database.

It is SQLInjection proof

Answer 1

Its worth remembering that while array_intersect and array_intersect_key are good they might well be overkill. In my situation I only wanted 1 element left, therefore the simplest option was just to rebuild the array I wanted based on the key/values I needed. I wonder at what point therefore the array_intersect's don't become worth it and you are simply better off with $new = array('whatI'=>'want');. I believe in the OP this is worth it but in smaller cases it might be overkill.

Alternatively in response to the original question simply using unset might have been a cheaper option - unset($post['one'],$post['two'],$post['three']). Again though, it relates to the point at which this becomes too inefficient and the array_intersect functions are better.