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# PHP Function array_intersect()

## Syntax

array array_intersect ( array $array1, array $array2 [, array $array3 ...] );

## Definition and Usage

Returns an array containing all the values of array1 that are present in all the arguments. Note that keys are preserved.

## Paramters

Parameter | Description
--- | ---
array1 | Required. The first array is the array that the others will be compared with.
array2 | Required. An array to be compared with the first array
array3 | Optional. An array to be compared with the first array

## Return Values

Returns an array containing all the entries from array1 that are not present in any of the other arrays.

## Example

Try out following example:

    <?php
    $array1 = array("a" => "green", "red", "blue");
    $array2 = array("b" => "green", "yellow", "red");
    $result = array_intersect($array1, $array2);
    print_r($result);
    ?>

This will produce following result:

    Array ( [a] => green [0] => red)

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