ARRAY_UDIFF_UASSOC(3) 1 ARRAY_UDIFF_UASSOC(3)
array_udiff_uassoc - Computes the difference of arrays with additional index check, compares data and indexes by a callback function
SYNOPSIS
array array_udiff_uassoc (array $array1, array $array2, [array $...], callable $value_compare_func, callable $key_compare_func)
DESCRIPTION
Computes the difference of arrays with additional index check, compares data and indexes by a callback function.
Note that the keys are used in the comparison unlike array_diff(3) and array_udiff(3).
PARAMETERS
o $array1
- The first array.
o $array2
- The second array.
o $value_compare_func
- The comparison function 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.
int callback (mixed $a, mixed $b)
o $key_compare_func
- The comparison of keys (indices) is done also by the callback function $key_compare_func. This behaviour is unlike what
array_udiff_assoc(3) does, since the latter compares the indices by using an internal function.
RETURN VALUES
Returns an array containing all the values from $array1 that are not present in any of the other arguments.
EXAMPLES
Example #1
array_udiff_uassoc(3) example
<?php
class cr {
private $priv_member;
function cr($val)
{
$this->priv_member = $val;
}
static function comp_func_cr($a, $b)
{
if ($a->priv_member === $b->priv_member) return 0;
return ($a->priv_member > $b->priv_member)? 1:-1;
}
static function comp_func_key($a, $b)
{
if ($a === $b) return 0;
return ($a > $b)? 1:-1;
}
}
$a = array("0.1" => new cr(9), "0.5" => new cr(12), 0 => new cr(23), 1=> new cr(4), 2 => new cr(-15),);
$b = array("0.2" => new cr(9), "0.5" => new cr(22), 0 => new cr(3), 1=> new cr(4), 2 => new cr(-15),);
$result = array_udiff_uassoc($a, $b, array("cr", "comp_func_cr"), array("cr", "comp_func_key"));
print_r($result);
?>
The above example will output:
Array
(
[0.1] => cr Object
(
[priv_member:private] => 9
)
[0.5] => cr Object
(
[priv_member:private] => 12
)
[0] => cr Object
(
[priv_member:private] => 23
)
)
In our example above you see the "1" => new cr(4) pair is present in both arrays and thus it is not in the output from the function. Keep
in mind that you have to supply 2 callback functions.
NOTES
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_udiff_uassoc($array1[0], $array2[0], "data_compare_func", "key_compare_func");.
SEE ALSO
array_diff(3), array_diff_assoc(3), array_udiff(3), array_udiff_assoc(3), array_intersect(3), array_intersect_assoc(3), array_uinter-
sect(3), array_uintersect_assoc(3), array_uintersect_uassoc(3).
PHP Documentation Group ARRAY_UDIFF_UASSOC(3)