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(PHP 5)

array_diff_uassoc — Computes the difference of arrays with additional index check which is performed by a user supplied callback function

array array_diff_uassoc ( array `$array1` , array `$array2` [, array `$...` ], callback `$key_compare_func` )

Compares * array1* against

Unlike array_diff_assoc() an user supplied callback function is used for the indices comparison, not internal function.

`array1`-
The array to compare from

`array2`-
An array to compare against

`...`-
More arrays to compare against

`key_compare_func`-
callback function to use. The callback 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.

Returns an array containing all the entries from * array1* that are not present in any of the other arrays.

**Example #1 array_diff_uassoc() example**

The *"a" => "green"* pair is present in both arrays and thus it is not in the output from the function. Unlike this, the pair *0 => "red"* is in the output because in the second argument *"red"* has key which is *1*.

`<?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 )

The equality of 2 indices is checked by the user supplied callback function.

Note: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");.

- array_diff() - Computes the difference of arrays
- array_diff_assoc() - Computes the difference of arrays with additional index check
- array_udiff() - Computes the difference of arrays by using a callback function for data comparison
- array_udiff_assoc() - Computes the difference of arrays with additional index check, compares data by a callback function
- array_udiff_uassoc() - Computes the difference of arrays with additional index check, compares data and indexes by a callback function
- array_intersect() - Computes the intersection of arrays
- array_intersect_assoc() - Computes the intersection of arrays with additional index check
- array_uintersect() - Computes the intersection of arrays, compares data by a callback function
- array_uintersect_assoc() - Computes the intersection of arrays with additional index check, compares data by a callback function
- array_uintersect_uassoc() - Computes the intersection of arrays with additional index check, compares data and indexes by a callback functions