array_flip
array_intersect_key
Array Functions
PHP Manual

# array_intersect_assoc

(PHP 4 >= 4.3.0, PHP 5, PHP 7)

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().

### Parameters

`array1`

  The array with master values to check.

`array2`

  An array to compare values against.

`...`

  A variable list of arrays to compare.

### Return Values

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

### Examples

Example #1 array_intersect_assoc() example

`<?php
$array1 = array("a" => "green", "b" => "brown", "c" => "blue", "red");
$array2 = array("a" => "green", "b" => "yellow", "blue", "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, and the key "b" is not returned because its values are different in each array.

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() - 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 separate callback functions
- array_diff() - Computes the difference of arrays
- array_diff_assoc() - Computes the difference of arrays with additional index check

array_flip
array_intersect_key
Array Functions
PHP Manual