PHP Function Reference

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

array Required. Specify an array to compare from.
arrays Required. Specify one or more arrays to compare against.
myfunction Required. Specify user-defined function to compare keys. The comparison function must return an integer <, =, or > than 0 if the first argument is <, =, or > than the second argument.

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
)

❮ PHP Array Reference