   #PHP Manual Array Functions array_diff_uassoc array_fill

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                                  array_diff

   (PHP 4 >= 4.0.1)
   array_diff -- Computes the difference of arrays

Description

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

   Multiple occurrences in $array1 are all treated the same way. This
   will output :
Array
(
    [1] => blue
)

     Note: Two elements are considered equal if and only if (string)
     $elem1 === (string) $elem2. In words: when the string
     representation is the same.

     Note: Please note that this function only checks one dimension of a
     n-dimensional array. Of course you can check deeper dimensions by
     using array_diff($array1[0], $array2[0]);.

   Warning

   This was broken in PHP 4.0.4!

   See also array_diff_assoc(), array_intersect(), and
   array_intersect_assoc().
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