array_udiff() function in php

array_udiff() function of PHP is used to return the difference of two or more PHP arrays by comparing the values of arrays with the help of a user-defined function. It is an inbuilt function of PHP.

Syntax:

here,

$array1, $array2 and $arrayN are PHP arrays and user_function() is a user define function which contains the conditions which applies on arrays to calculate the difference.

Example 1:

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

$result=array_udiff($arr1,$arr2,"user_function");
echo "<pre>";
print_r($result);
?>

Output:

Example 2:

<?php
function user_function($x,$y)
{
if ($x===$y)
  {
  return 0;
  }
  return ($x>$y)?1:-1;
}

$arr1=array(1,2,3,4,5,6,7,8,9);
$arr2=array(2,4,6,8);

$result=array_udiff($arr1,$arr2,"user_function");
echo "<pre>";
print_r($result);
?>

Output: