The array_diff_assoc() function compares array keys and values, and returns the differences. The array_diff() function only compares the values, whereas in array_diff_assoc() function both the keys and values are used for comparison.
Syntax
array_diff_assoc(arr1, arr2, arr3, arr4, …)
Parameters
arr1 − Array to compare from. Required.
arr2 − Array to compare against. Required.
arr3 − You can add more arrays to compare. Optional.
arr4 − You can add more arrays to compare. Optional.
Return
The array_diff_assoc() function returns the comparison between both the arrays. It returns an array containing all the values from arr1 that are not present in any of the other arrays.
Example
<?php
$arr1 = array("p"=>"football","q"=>"cricket","r"=>"hockey");
$arr2 = array("s"=>"football","t"=>"cricket");
$res = array_diff_assoc($arr1,$arr2);
print_r($res);
?>
Output
Array ( [p] => football [q] => cricket [r] => hockey )