array_intersect_ukey

array array_intersect_ukey(array, array`array1`

[, ... array`array2`

], callable`arrayN`

)`function`

Returns an array consisting of every element in
* array1* whose keys also exist in every other
array.

The function * function* is used to
compare the values of the elements for equality. The function is
called with two parameters—the keys to compare. It should return an
integer less than 0 if the first argument is less than the second, 0
if the first and second arguments are equal, and an integer greater
than 0 if the first argument is greater than the second.

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