PHP array_udiff() function

The array_udiff( ) function is an inbuilt function of PHP. The array_udiff( ) function is used to compute the difference of given arrays by using a callback function for data comparison. This function was introduced in PHP 5.1.0.

Syntax

array array_udiff ( array $array1 , array $array2 [, array $... ], callable $value_compare_func);

Parameters

Parameter	Description	Is compulsory
array1	The first Array.	compulsory
array2	Array to compare against.	compulsory
array3,...	More arrays to compare against.	Optional
Value_compare_function	A string that define a callable comparison function.	compulsory

Return Values

The array_udiff( ) function returns an array containing the entries from array1 that are not present in any of the other arrays.

Important note:

User-defined function must returns an integer <, =, or > than 0 if the first argument is <, =, or > than the second argument.

Example 1

<?php
function userfunction($a,$b)
{
		if ($a===$b)
{
		return 0;
	 }
		return ($a>$b)?1:-1;
}
$a1=array("a"=>"A","b"=>"HTML","c"=>"javatpoint");
$a2=array("a"=>"Apple","b"=>"CSS","e"=>"PHP");
$result=array_udiff($a1,$a2,"userfunction");
print_r($result);
?>

Output:

Array
(
    [a] => A
    [b] => HTML
    [c] =>javatpoint
)

Example 2

<?php
function callbackfunction($a,$b)
{
if ($a===$b)
{
return 0;
}
		return ($a>$b)?1:-1;
}
$lang1=array("a"=>"javatpoint","b"=>"c","c"=>"ruby","php");
$lang2=array("A"=>"javatpoint","b"=>"C","php","python");
$lang3=array("a"=>"c","b"=>"javatpoint","php","python");
$result=array_udiff($lang1,$lang2,$lang3,"callbackfunction");
print_r($result);
?>

Output:

Array
(
    [c] => ruby
)

Example 3

<?php
function  userfunction($a, $b)
{
		if ($a === $b) 
{
		return 0;
	 }
		return ($a > $b) ? 1 : -1;
}

$arr1 = array(
		 "a" => "C",
		 "b" => "C++",
		"d" => "Java",
		 "r" => "HTML"
);
$arr2 = array(
		"a" => "C",
		"y" => "C++",
		"d" => "C#",
		"x" => "PHP"
);
		$result = array_udiff($arr1, $arr2, "userfunction");
print_r($result);
?>

Output:

Array
(
    [d] => Java
    [r] => HTML
)

Example 4

<?php
function myfunction($a,$b)
{
if ($a===$b)
	{
		return 0;
	}
		return ($a>$b)?1:-1;
}

$city1=array("a"=>"bengaluru","b"=>"chennai","c"=>"noida");
$city2=array("a"=>"noida","b"=>"hyderabad","e"=>"noida");
$result=array_udiff($city1,$city2,"myfunction");
print_r($result);
?>

Output:

Array
(
    [a] =>bengaluru
    [b] =>chennai
)

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