array_diff() returns an array
containing all the values of
array1 that are not present in any of the other
arguments. Note that keys are preserved.
This makes $result have array ("blue");. Multiple occurrences in
$array1 are all treated the same way.
注: Two elements are considered equal if and only if (string) $elem1 === (string) $elem2. In words: when the string representation is the same.
注: Please note that this function only checks one dimension of a n-dimensional array. Of course you can check deeper dimensions by using array_diff($array1[0], $array2[0]);.
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See also array_diff_assoc(),
array_intersect() and
array_intersect_assoc().