PHP array_udiff_assoc() function

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array_udiff_assoc() function of PHP is used to return the difference of two or more arrays by comparing the keys and values of arrays with the help of a user-defined function or the callback function.

It is an inbuilt function of PHP.

Syntax:

array_udiff_assoc($array1, $array2, ........, $arrayN, user_function);

here,

$array1, $array2 and $arrayN are php arrays and user_function is a user define function which used to calculate the difference between arrays and return the unique elements of first array.

Example 1:

<?php
function user_function($x,$y)
{
if ($x===$y)
  {
  return 0;
  }
  return ($x>$y)?1:-1;
}
$arr1=array("FRUIT1"=>"apple","FRUIT2"=>"guava","FRUIT3"=>"banana");
$arr2=array("FRUIT4"=>"apple","FRUIT2"=>"guava","FRUIT5"=>"fig");
$result=array_udiff_assoc($arr1,$arr2,"user_function");
echo "<pre>";
print_r($result);
?>

Output:

Result - PHP array_udiff_assoc()