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

# array_intersect_uassoc

(PHP 5, PHP 7, PHP 8)

array_intersect_uassoc — Computes the intersection of arrays with additional index check, compares indexes by a callback function

### Description

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

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.

  callback(mixed `$a`, mixed `$b`): int
  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
    )

### See Also

- array_intersect() - Computes the intersection of arrays
- array_intersect_assoc() - Computes the intersection of arrays with additional index check
- array_uintersect_assoc() - Computes the intersection of arrays with additional index check, compares data by a callback function
- array_uintersect_uassoc() - Computes the intersection of arrays with additional index check, compares data and indexes by separate callback functions
- array_intersect_key() - Computes the intersection of arrays using keys for comparison
- array_intersect_ukey() - Computes the intersection of arrays using a callback function on the keys for comparison

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