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(PHP 4 >= 4.3.0, PHP 5)

array_intersect_assoc — Computes the intersection of arrays with additional index check

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().

`array1`-
The array with master values to check.

`array2`-
An array to compare values against.

`array`-
A variable list of arrays to compare.

Returns an associative array containing all the values in * array1* that are present in all of the arguments.

**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

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.

- array_intersect() - Computes the intersection of arrays
- array_uintersect_assoc() - Computes the intersection of arrays with additional index check, compares data by a callback function
- array_intersect_uassoc() - Computes the intersection of arrays with additional index check, compares indexes by a callback function
- array_uintersect_uassoc() - Computes the intersection of arrays with additional index check, compares data and indexes by a callback functions
- array_diff() - Computes the difference of arrays
- array_diff_assoc() - Computes the difference of arrays with additional index check