   #PHP Manual Array Functions array_diff_assoc array_diff

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                               array_diff_uassoc

   (no version information, might be only in CVS)
   array_diff_uassoc -- Computes the difference of arrays with additional
   index check which is performed by a user supplied callback function.

Description

   array array_diff_assoc ( array array1, array array2 [, array ...,
   callback key_compare_func])

   array_diff_uassoc() returns an array containing all the values from
   array1 that are not present in any of the other arguments. Note that
   the keys are used in the comparison unlike array_diff(). This
   comparison is done by a user supplied callback function. 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_assoc() where an
   internal function for comparing the indices is used.

   Example 1. array_diff_uassoc() example
   <?php
   function key_compare_func($a, $b) {
       if ($a === $b) return 0;
       return ($a > $b)? 1:-1;
   }
   $array1 = array("a" => "green", "b" => "brown", "c" => "blue", "red");
   $array2 = array("a" => "green", "yellow", "red");
   $result = array_diff_uassoc($array1, $array2, "key_compare_func");
   ?>

   The result is:
Array
(
    [b] => brown
    [c] => blue
    [0] => red
)

   In our example above you see the "a" => "green" pair is present in
   both arrays and thus it is not in the ouput from the function. Unlike
   this, the pair 0 => "red" is in the ouput because in the second
   argument "red" has key which is 1.

   The equality of 2 indices is checked by the user supplied callback
   function.

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

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