(PHP 4 >= 4.0.1, PHP 5)
array_intersect — Computes the intersection of arrays
array_intersect() returns an array containing all the values of array1 that are present in all the arguments. Note that keys are preserved.
The array with master values to check.
An array to compare values against.
A variable list of arrays to compare.
Returns an array containing all of the values in array1 whose values exist in all of the parameters.
Example #1 array_intersect() example
<?php
$array1 = array("a" => "green", "red", "blue");
$array2 = array("b" => "green", "yellow", "red");
$result = array_intersect($array1, $array2);
print_r($result);
?>
The above example will output:
Array
(
[a] => green
[0] => red
)
Note: Two elements are considered equal if and only if (string) $elem1 === (string) $elem2. In words: when the string representation is the same.