array_intersect_ukey(): intersection between two arrays considering keys for checks through callback functionThis function takes two or more arrays as input and then returns the result array as intersection considering keys.
my_function() : is the callback function to return integer less than , equal to or greater than zero after comparing the keys.
Returns all elements of $array1 which are present in $array2 considering keys only.
Example with two arrays
Output is here.
Keys of the first index are retained. ( no re-indexing done here) .
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