PHP array_udiff_uassoc() function

The array_udiff_uassoc( ) function is an inbuilt function of PHP. The array_udiff_uassoc( ) function compares two or more arrays in two user-made functions, and returns an array containing the elements from the first array. This function was introduced in PHP 5.0.

Syntax

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

Parameters

Parameter	Description	Required/Optional
array1	Array to compare from.	compulsory
array2	Array to compare against.	compulsory
array3	More arrays to compare against.	Optional
Value_compare_function	User-defined function to compare the array values.	compulsory
Key_compare_function	User-defined function to compare the array keys.	compulsory

Return Values

The array_udiff_uassoc( ) function returns an array containing all the values from array1 that are not present in any of the other arguments.

Example 1

<?php
function myfunction1($v1,$v2) 
{
if ($v1 === $v2) 
{
return 0;
}
return 1;
}
	function myfunction2($v1,$v2) 
{
if ($v1 === $v2) 
{
return 0;
}
return 1;
}
$mobile1 = array("a"=>"samsung","b"=>"oppo","c"=>"vivo");
$mobile2 = array("a"=>"samsung","b"=>"oppo","c"=>"micromax");
print_r(array_udiff_uassoc($mobile1,$mobile2,"myfunction1","myfunction2"));
?>

Output:

Array
(
    [c] => vivo
)

Example 2

<?php
function mykey($v1,$v2) 
{
if ($v1===$v2)
	{
return 0;
	}
return 1;
}
function myvalue($v1,$v2) 
{
if ($v1===$v2)
	{
return 0;
	}
return 1;
}
$a1=array("a"=>"sachin","b"=>"sehwag","c"=>"virat");
$a2=array("a"=>"sachin","b"=>"sehwag","c"=>"ganguly");
print_r(array_udiff_uassoc($a1,$a2,"mykey","myvalue"));
?>

Output:

Array
(
    [c] =>virat
)

Example 3

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

function uservalue($a,$b)
{
if ($a===$b)
{
return 0;
}
return ($a>$b)?1:-1;
}
$news1=array("a"=>"aajtak","b"=>"zee news","c"=>"ndtv");
$news2=array("a"=>"aajtak","b"=>"zee news","c"=>"zee news");
$result=array_udiff_uassoc($news1,$news2,"userkey","uservalue");
print_r($result);
?>

Output:

Array
(
    [c] =>ndtv
)

Example 4

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

$lang1 = array(
		 "m" => "C ",
		 "n" => "Java",
		 "o" => "C#",
		"x" => "php",
		 "y" => "python",
);

$lang2 = array(
		"m" => "C",
		"b" => "Java",
		"c" => "C#",
		"x" => "php",
		"n" => "python",
);
$result = array_udiff_uassoc($lang1,$lang2, "myvalue", "mykey");
print_r($result);
?>

Output:

Array
(
    [m] => C 
    [n] => Java
    [o] => C#
    [y] => python
)

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