What is the difference between array_udiff_assoc() and array_diff_uassoc()?

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They both do the same, but udiff-assoc compares the DATA with the user supplied function, while diff-uassoc compares the INDEX with the user supplied function.

As an answer to @lonsesomeday : as indicated by the ‘u’, diff_assoc will use internal functions for all comparisons, and udiff_uassoc uses provided callbacks for index and data comparison.

http://www.php.net/manual/en/function.array-diff-uassoc.php

http://www.php.net/manual/en/function.array-udiff-assoc.php

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