PHP array_diff_assoc function

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array_diff_assoc

(PHP 4 >= 4.3.0, PHP 5)

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().

Example 1. array_diff_assoc() example

$array1 = array("a" => "green", "b" => "brown", "c" => "blue", "red");
$array2 = array("a" => "green", "yellow", "red");
$result = array_diff_assoc($array1, $array2);
print_r($result);

The above example will output:

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.

Note:
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().