PHP: array_diff_uassoc() function

Last update on August 19 2022 21:50:40 (UTC/GMT +8 hours)

PHP: Compares an array against another and returns the difference

The array_diff_uassoc() function is used to compare two or more arrays with an additional user supplied function. The function compares array1 against array2 and returns the difference. Unlike array_diff() the array keys are used in the comparison.

Version:

(PHP 4 and above)

Syntax:

array_diff_uassoc(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 returns 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 user_key_compare_func($x, $y)
{
if ($x === $y) 
{
return 0;
}
return ($x > $y)? 1:-1;
}
$array1 = array('Math'=>77, 20, 'Geography'=>89, 30, 'Language'=>67);
$array2 = array('Math'=>77, 'science'=>91 ,20, 'History'=>71);
$diff_result = array_diff_uassoc($array1, $array2, "user_key_compare_func");
print_r($diff_result);
?>

Output:

Array([Geography]=>89[1]=>30[Language]=>67)

Pictorial Presentation:

php function reference: array_diff_uassoc() function

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