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PHP Function array_diff_uassoc()

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Syntax

array_diff_uassoc ( $array1, $array2 [, $array3..., callback $key_compare_func] );

Definition and Usage

Compares array1 against array2 and returns the difference. Unlike array_diff() the array keys are used in the comparision.

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

Paramters

ParameterDescription
array1Required. The array to compare from
array2Required. An array to be compared with the first array
array3Optional. An array to be compared with the first array
key_compare_funcRequired. 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.

Return Values

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

Example

Try out following 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);

?> 

This will produce following result:

Array ( [b] => brown [c] => blue [0] => red )
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