The array_diff_uassoc() function compares 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: Both the key and the value is used in the automatic comparison, then, in the
user-defined function, only the keys are being compared.
The output of the code above will be:
How to assign more than two arrays to the function
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