PHP array_intersect_uassoc() Function

The PHP array_intersect_uassoc() function compares keys and values of an array against one or more other arrays and returns all elements of the first array that are present in all of the other arrays. This function compares keys using a user-defined comparison function.

Unlike array_intersect() function, it uses array keys also for comparison. Unlike array_intersect_assoc(), this function uses a user-defined function to compare keys.

Syntax

array_intersect_uassoc(array, arrays, myfunction)

Parameters

Return Value

Returns an array containing all the entries from array which are present in all of the other arrays.

Exceptions

NA.

Example:

The example below shows the usage of array_intersect_uassoc() function.

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

$Arr1 = array(0, 1, 2, 3);
$Arr2 = array('00', '01', 2, 3);

//comparing Arr1 against Arr2
$Arr1_intersect_Arr2 = 
    array_intersect_uassoc($Arr1, $Arr2, 'MyFunc');
print_r($Arr1_intersect_Arr2);
?>

The output of the above code will be:

Array
(
    [2] => 2
    [3] => 3
)

Example:

Consider one more example which illustrates on usage of array_intersect_uassoc() function.

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

$Arr1 = array("a"=>"Red", 
              "b"=>"Blue",
              "c"=>"Green");
$Arr2 = array("a"=>"Red", "Blue", "Green");

//comparing Arr1 against Arr2
$Arr1_intersect_Arr2 = 
    array_intersect_uassoc($Arr1, $Arr2, 'MyFunc');
print_r($Arr1_intersect_Arr2);
?>

The output of the above code will be:

Array
(
    [a] => Red
)