PHP: array_diff_ukey() function

Last update on August 19 2022 21:51:15 (UTC/GMT +8 hours)

PHP: Compares the keys from an array against the keys from another

The array_diff_ukey() function is used to compare two or more arrays using an additional user supplied function on the keys for comparison.The function compares the keys from array1 against the keys from array2 and returns the difference. This function is like array_diff() except the comparison is done on the keys instead of the values.

Version:

(PHP 4 and above)

Syntax:

array_diff_ukey(array1, array2, array3,.....user-defined-function)

Parameter:

Name	Description	Required / Optional	Type
array1	The specified array which will be compared with other arrays.	Required	Array
array2	Compared with the first array.	Required	Array
array3	Compared with the first array.	Optional	Array
user-defined-function	The specified callback function. The 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.	Required	-

Return value:

An array containing all the entries from array1 that are not present in any of the other arrays i.e. array2, array3.

Value Type: Array

Example:

<?php
function abc($ukey1, $ukey2)
{
if ($ukey1 == $ukey2)
return 0;
else if ($ukey1 > $ukey2)
return 1;
else
return -1;
}
$array1 = array('Orange' => 1, 'Apple' => 2, 'Banana' => 3, 'Chery'=> 4);
$array2 = array('Banana' => 5, 'Apple' => 6, 'Mango' => 7, 'Guava'=> 8);
var_dump(array_diff_ukey($array1, $array2, 'abc'));
?>

Output:

array(2) {["Orange"]=> int(1)["Chery"]=> int(4)}

Pictorial Presentation:

php function reference: array_diff_ukey() function

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