PHP Manual: Computes the intersection of arrays with additional index check, compares indexes by a callback function

Description

array array_intersect_uassoc(array $array, array ...$arrays, callable $key_compare_func)

array_intersect_uassoc returns an array containing all the values of array that are present in all the arguments. Note that the keys are used in the comparison unlike in array_intersect.

Parameters

array: Initial array for comparison of the arrays.
arrays: Arrays to compare keys against.
key_compare_func: The comparison function must return an integer less than, equal to, or greater than zero if the first argument is considered to be respectively less than, equal to, or greater than the second.

int callback(mixed $a, mixed $b)

Caution
Returning non-integer values from the comparison function, such as float, will result in an internal cast to int of the callback's return value. So values such as 0.99 and 0.1 will both be cast to an integer value of 0, which will compare such values as equal.

Return Values

Returns the values of array whose values exist in all of the arguments.

Examples

Example #1 array_intersect_uassoc example

<?php
$array1 = array("a" => "green", "b" => "brown", "c" => "blue", "red");
$array2 = array("a" => "GREEN", "B" => "brown", "yellow", "red");

print_r(array_intersect_uassoc($array1, $array2, "strcasecmp"));
?>

The above example will output:

Array
(
    [b] => brown
)

array_intersect_uassoc

Description

Parameters

Return Values

Examples

See Also