Definition
The array_diff_uassoc() function compares the keys and values of two (or more) arrays, and returns the differences, using a user-defined function to compare the keys.
Syntax
array_diff_uassoc(array1, array2, array3, ..., myfunction)
Parameters
| Parameter | Description |
|---|---|
array1 |
Required. The array to compare from. |
array2 |
Required. An array to compare against. |
array3 |
Optional. More arrays to compare against. |
array2 |
Required. A string that define a callable comparison function. The comparison function must return an integer <, =, or > than 0 if the first argument is <, =, or > than the second argument |
Example
<?php
function compare($a, $b){
// Converting key to lowercase
$a = strtolower($a);
$b = strtolower($b);
if($a == $b){
return 0;
}
return ($a < $b) ? -1 : 1;
}
// Sample arrays
$array1 = array("a" => "apple", "b" => "ball", "c" => "cat", "dog");
$array2 = array("A" => "APPLE", "B" => "ball", "C" => "camel");
// Computing the difference
$result = array_diff_uassoc($array1, $array2, "compare");
print_r($result);