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# array_intersect_assoc

(PHP 4 >= 4.3.0, PHP 5)

array_intersect_assoc -- Computes the intersection of arrays with additional index check

## Description

array array_intersect_assoc ( array array1, array array2 [, array ...] )

array_intersect_assoc() returns an array containing all the values of `array1` that are present in all the arguments. Note that the keys are used in the comparison unlike in array_intersect().

Example 1. array_intersect_assoc() example

`<?php $array1 = array("a" => "green", "b" => "brown", "c" => "blue", "red"); $array2 = array("a" => "green", "yellow", "red"); $result_array = array_intersect_assoc($array1, $array2); print_r($result_array); ?>`

The above example will output:

    Array
    (
        [a] => green
    )

In our example you see that only the pair `"a" => "green"` is present in both arrays and thus is returned. The value `"red"` is not returned because in `$array1` its key is `0` while the key of "red" in `$array2` is `1`.

The two values from the `key => value` pairs are considered equal only if `(string) $elem1 === (string) $elem2` . In other words a strict type check is executed so the string representation must be the same.

See also array_intersect(), array_uintersect_assoc(), array_intersect_uassoc(), array_uintersect_uassoc(), array_diff() and array_diff_assoc().

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