The array_diff_ukey() function compares the keys in two or more arrays, checking for differences,
before comparing the keys in a user-defined function, then returns an array with the keys and
values from the first array, if the function allows it.
Hint: You can compare the first array with one array, or as many as you like.
Note: Only the keys have to be the same to get a match, both in the automatic comparison
and in the user-defined function.
The output of the code above will be:
How to assign more than two arrays to the function
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