The array_udiff() function compares two or more arrays, in a user-made function, and returns an
array containing the elements from the first array, if the user-made function allows it. The
user-made function compares array values, and returns a numeric value, a positive number (1) if
the returned array should contain this element, and 0, or a negative number (-1), if not.
Hint: You can compare the first array with one array, or as many as you like.
Note: Only the value is used in the comparison.
The output of the code above will be:
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