Allow array_diff() and array_intersect() with single array argument #6097
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As discussed with @bwoebi and @Crell recently, we should allow calling
array_diff()
and friends with only one array argument. This allows usages likearray_diff($array, ...$excludes)
, even if$excludes
happens to be empty. We already did similar changes for a couple other array functions like array_merge.