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array_diff_assoc

PHP function Edit on GitHub ✎

(PHP 4 >= 4.3.0, PHP 5, PHP 7, PHP 8)

Computes the difference of arrays with additional index check

Description

array_diff_assoc(array $array, array ...$arrays): array

Compares array against arrays and returns the difference. Unlike array_diff() the array keys are also used in the comparison.

Parameters

array: The array to compare from
arrays: Arrays to compare against

Return Values

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

Changelog

Version	Description

Examples

array_diff_assoc() example

In this 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 the key of "red" is automatically assigned to 0 in the first array, whereas it is assigned to 1 in the second array as the key 0 is already taken by yellow.

php

<?php
$array1 = array("a" => "green", "b" => "brown", "c" => "blue", "red");
$array2 = array("a" => "green", "yellow", "red");
$result = array_diff_assoc($array1, $array2);
print_r($result);
?>

The above example will output:

output

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

array_diff_assoc() example

Two values from key => value pairs are considered equal only if (string) $elem1 === (string) $elem2. In other words a strict check takes place so the string representations must be the same.

php

<?php
$array1 = array(0, 1, 2);
$array2 = array("00", "01", "2");
$result = array_diff_assoc($array1, $array2);
print_r($result);
?>

The above example will output:

output

Array
(
    [0] => 0
    [1] => 1
)

Notes

Note

This function only checks one dimension of an n-dimensional array. It is possible to check deeper dimensions by using, for example, array_diff_assoc($array1[0], $array2[0]);.