(PHP 5)
array_diff_uassoc — Computes the difference of arrays with additional index check which is performed by a user supplied callback function
Compares array1 against array2 and returns the difference. Unlike array_diff() the array keys are used in the comparison.
Unlike array_diff_assoc() an user supplied callback function is used for the indices comparison, not internal function.
The array to compare from
An array to compare against
More arrays to compare against
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");.