array_diff_ukey() function in php

array_diff_ukey() function of PHP is used to calculate the difference of two or more arrays by comparing the keys of that arrays with the help of a user built function.

Syntax:

Here

1. $arr1 is the array which different values return by the function.

2. $arr2 and $arrN are the arrays which keys are compared with the first array.

3. function is the user define function which compare the keys of arrays and calculate the result.

Example:

<?php
function user_function($x,$y)
{
if ($x===$y)
  {
  return 0;
  }
  return ($x>$y)?1:-1;
}
$arr1=array("fruit1"=>"mango","fruit2"=>"banana","fruit3"=>"pear");
$arr2=array("fruit4"=>"orange","fruit1"=>"mango","fruit3"=>"grapes");
$result=array_diff_ukey($arr1,$arr2,"user_function");
print_r($result);
?>

Output: