PHP array_uintersect_uassoc() function

The array_uintersect_uassoc( ) is an inbuilt function of PHP. The array_uintersect_uassoc() function uses two user-defined functions to compare the keys and values of two or more arrays, and returns the matches. This function was introduced in PHP 5.0.

Syntax

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

Parameter

Parameter	Description	Is compulsory
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 values.	compulsory
Key_comapre_function	User defined function to compare keys.	compulsory

Returns

The array_uintersect_uassoc( ) function returns an array containing the entries from array1 that are present in all the arguments.

Important note:

function_key and function_value must return an integer <,=, or > than 0 if the first argument is <,=,or > than the second argument.

Example 1

<?php
function keyfunction($u,$v)
{
		if ($u===$v)
{
		return 0;
	 }
		return ($u>$v)?1:-1;
	}
function valuefunction($u,$v)
{
		if ($u===$v)
{
		return 0;
	}
		return ($u>$v)?1:-1;
	}
$a1=array("a"=>"Apple","b"=>"Ball","c"=>"Cat");
$a2=array("a"=>"Apple","b"=>"Ball","c"=>"javatpoint");
$result=array_uintersect_uassoc($a1,$a2,"keyfunction","valuefunction");
print_r($result);
?>

Output:

Array ( [a] => Apple [b] => Ball )

Example 2

<?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;
}
$a1=array("a"=>"PHP","b"=>"JAVA","c"=>"bluej");
$a2=array("a"=>"PHP","b"=>"JAVA","c"=>"JAVA");
$result=array_uintersect_uassoc($a1,$a2,"userkey","uservalue");
print_r($result);
?>

Output:

Array ( [a] => PHP [b] => JAVA )

Example 3

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

function myvalue($a, $b)
{
		if ($a == $b)
		return 0;
return ($a > $b) ? 1 : -1;
}
$arr1=array("1"=>"java","2"=>"javatpoint","3"=>"PHP");
$arr2=array("1"=>"java","2"=>"inheritance","3"=>"PHP");
$res = array_uintersect_uassoc($arr1, $arr2, "mykey", "myvalue");
print_r($res);
?>

Output:

Array
(
    [1] => java
    [3] => PHP
)

Example 4

<?php
$arr1 = array("a" => "java", "b" => "php", "c" => "pearl", "swift");
$arr2 = array("a" => "JAVA", "B" => "php", "python", "swift");
print_r(array_uintersect_uassoc($arr1, $arr2, "strcasecmp", "strcasecmp"));
?>

Output:

Array
(
    [a] => java
    [b] =>php
)

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