(PHP4 >= 4.0.1)

array_diff -- Computes the difference of arrays


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

Array_diff() returns an array containing all the values of array1 that are not present in any of the other arguments. Note that keys are preserved.

Example 1. Array_diff() example

$array1 = array ("a" => "green", "red", "blue");
$array2 = array ("b" => "green", "yellow", "red");
$result = array_diff ($array1, $array2);

This makes $result have array ("blue");

See also array_intersect().