(PHP 4 >= 4.3.0, PHP 5, PHP 7)
array_diff_assoc — Computes the difference of arrays with additional index check
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.
array
The array to compare from
arrays
Arrays to compare against
Returns an array containing all the values from array that are not present in any of the other arrays.
Example #1 array_diff_assoc() example
In this example you see 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 in the second argument "red" has key which is 1.
<?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:
Array
(
[b] => brown
[c] => blue
[0] => red
)
Example #2 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
$array1 = array(0, 1, 2);
$array2 = array("00", "01", "2");
$result = array_diff_assoc($array1, $array2);
print_r($result);
?> The above example will output:
Array
(
[0] => 0
[1] => 1
)
Note: This function only checks one dimension of a n-dimensional array. Of course you can check deeper dimensions by using, for example,
array_diff_assoc($array1[0], $array2[0]);.
Note: Ensure you pass arguments in the correct order when comparing similar arrays with more keys. The new array should be the first in the list.
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https://www.php.net/manual/en/function.array-diff-assoc.php