array_diff_assoc() returns an
array containing all the values from array1 that are not present in any of
the other arguments. Note that the keys are used in the
comparison unlike array_diff().
In our example above you see the "a"
= "green" pair is present in both arrays and thus it
is not in the ouput from the function. Unlike this, the pair
0 = "red" is in the ouput
because in the second argument "red"
has key which is 1.
Two values from key = value pairs are considered
equal only if (string) $elem1 ===
(string) $elem2 . In other words a strict check takes
place so the string representations must be the same.
注: Please note that this function only checks one dimension of a n-dimensional array. Of course you can check deeper dimensions by using, for example, array_diff_assoc($array1[0], $array2[0]);.
See also array_diff(),
array_intersect(), and
array_intersect_assoc().