array_udiff_uassoc() function in php

PHP array_udiff_uassoc() function 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:

here,

• $array1 is a PHP array which unique values is returned by this function.
• $array2 and $arrayN are php arrays which values and keys compared to $array1.
• key_function is a user-defined function which used to compare the keys of arrays. It is mandatory.
• value_function is also a user-defined function which used to compare the values of arrays. It is also mandatory.

Note: The basic difference between array_udiff_assoc() and array_udiff_uassoc() is array_udiff_uassoc() function contains two user defined comparison function one for keys and other for values.

Example 1:

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

Output: