[PHP] Question about array_search

[Brian Dunning]

Say I'm trying to add a value to an array, only if it's not already in 
there somewhere; so I do an array_search to see. The problem is that if 
the item is at index 0 in the array, array_search gives the same answer 
as if it's not in there at all. How does one circumvent this potential 
pitfall?

TIA,
- Brian
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