Syntax
array
array_diff_uassoc ( array array1, array array2 [, array ..., callback key_compare_func] )
array_diff_uassoc() 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().
This comparison is done by a user supplied callback function.
It must return an integer less than, equal
to, or greater than zero if the first argument is considered to
be respectively less than, equal to, or greater than the
second. This is unlike array_diff_assoc() where an
internal function for comparing the indices is used.
Example 1. array_diff_uassoc() example
<?php
function key_compare_func($a, $b)
{
if ($a === $b) {
return 0;
}
return ($a > $b)? 1:-1;
}
$array1 = array("a" => "green", "b" => "brown", "c" => "blue", "red");
$array2 = array("a" => "green", "yellow", "red");
$result = array_diff_uassoc($array1, $array2, "key_compare_func");
print_r($result);
?>
|
The above example will output: Array
(
[b] => brown
[c] => blue
[0] => red
) |
|
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.
The equality of 2 indices is checked by the user supplied callback function.
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_uassoc($array1[0], $array2[0], "key_compare_func");.
See also
array_diff(),
array_diff_assoc(),
array_udiff(),
array_udiff_assoc(),
array_udiff_uassoc(),
array_intersect(),
array_intersect_assoc(),
array_uintersect(),
array_uintersect_assoc() and
array_uintersect_uassoc().