   #PHP Manual Array Functions array_udiff_uassoc array_unique

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                                  array_udiff

   (no version information, might be only in CVS)
   array_udiff -- Computes the difference of arrays by using callback
   function for data comparison.

Description

   array array_udiff ( array array1, array array2 [, array ..., callback
   data_compare_func])

   array_udiff() returns an array containing all the values of array1
   that are not present in any of the other arguments. Note that keys are
   preserved. For the comparison of the data data_compare_func is used.
   It must return an integer less than, equal to, or greater than zero if
   the first argument is considered to be respectively less than, equal
   to, or greater than the second. This is unlike array_diff() which uses
   an internal function for comparing the data.

   Example 1. array_udiff() example
   <?php
   class cr {
       var $priv_member;
       function cr($val) {
           $this->priv_member = $val;
       }
       function comp_func_cr($a, $b) {
           if ($a->priv_member === $b->priv_member) return 0;
           return ($a->priv_member > $b->priv_member)? 1:-1;
       }
   }
   $a = array("0.1" => new cr(9), "0.5" => new cr(12), 0 => new cr(23),
   1=> new cr(4), 2 => new cr(-15),);
   $b = array("0.2" => new cr(9), "0.5" => new cr(22), 0 => new cr(3),
   1=> new cr(4), 2 => new cr(-15),);
   $result = array_udiff($a, $b, array("cr", "comp_func_cr"));
   print_r($result);
   ?>

   The result is:
Array
(
    [0.5] => cr Object
        (
            [priv_member:private] => 12
        )

    [0] => cr Object
        (
            [priv_member:private] => 23
        )

)

     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_udiff($array1[0], $array2[0], "data_compare_func");.

   See also array_diff(), array_diff_assoc(), array_diff_uassoc(),
   array_udiff_assoc(), array_udiff_uassoc(), array_intersect(),
   array_intersect_assoc(), array_uintersect(), array_uintersect_assoc()
   and array_uintersect_uassoc().
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