<?php

/*
 * Sample code to provide a recursive version of the standard array_unique() 
 * function.
 *
 * Sample usage: $uniqarr = array_unique_recursive($array);
 * with strict type checking: $uniqarr = array_unique_recursive($array,true);
 *
 * Open Source Code:   If you use this code on your site for public
 * access (i.e. on the Internet) then you must attribute the author and
 * source web site:
 *    http://www.pgregg.com/projects/php/code/array_unique_recursive.php
 *    http://www.pgregg.com/projects/php/code/array_unique_recursive.phps
 *
 * (c) Paul Gregg, 2008
 * 29 June 2008
 * http://www.pgregg.com/projects/
 *
 */


Function array_unique_recursive($arr, $forcetype=false) {
  static $seen = array();
  static $depth = -1;
  ++$depth;
  if (is_array($arr)) {
    foreach ($arr as $index => $value) {
      $type = gettype($value);
      if (is_array($value)) {
        $arr[$index] = array_unique_recursive($value, $forcetype);
        if (count($arr[$index])==0) unset($arr[$index]);
      } else {
        if ($forcetype && isset($seen[$type][$value]) && $seen[$type][$value]===$value) {
          unset($arr[$index]);
        } elseif (!$forcetype && isset($seen[$value]) && $seen[$value]==$value) {
          unset($arr[$index]);
        }
        if ($forcetype)
          $seen[$type][$value] = $value;
        else
          $seen[$value] = $value;
      }
    }
  }
  if ($depth === 0) $seen = array();
  --$depth;
  return $arr;
}

show_source(__FILE__);
echo '<hr>';

$a[0][0] = 1;
$a[0][1] = 2;
$a[0][2] = 3;
$a[0][3] = 4;
$a[0][4] = 2;
$a[1][0] = 1;
$a[1][1] = 2;
$a[1][2] = "2";
$a[1][3] = 4;
$a[1][4] = 2;

echo '<br>Input: <pre>', var_export($a, true), '</pre>', "\n\n";

$b = array_unique_recursive($a);
echo '<br>Loose type array_unique_recursive Output: <pre>', var_export($b, true), '</pre>', "\n\n";

$b = array_unique_recursive($a, true);
echo '<br>Strict type array_unique_recursive Output: <pre>', var_export($b, true), '</pre>', "\n\n";


#niklas
$a = array(array('foo'), array('bar'), array('bar'));
echo '<br>Input: <pre>', var_export($a, true), '</pre>', "\n\n";
$b = array_unique_recursive($a);
echo '<br>Loose type array_unique_recursive Output: <pre>', var_export($b, true), '</pre>', "\n\n";

array (
  0 => 
  array (
    0 => 1,
    1 => 2,
    2 => 3,
    3 => 4,
    4 => 2,
  ),
  1 => 
  array (
    0 => 1,
    1 => 2,
    2 => '2',
    3 => 4,
    4 => 2,
  ),
)

array (
  0 => 
  array (
    0 => 1,
    1 => 2,
    2 => 3,
    3 => 4,
  ),
)

array (
  0 => 
  array (
    0 => 1,
    1 => 2,
    2 => 3,
    3 => 4,
  ),
  1 => 
  array (
    2 => '2',
  ),
)

array (
  0 => 
  array (
    0 => 'foo',
  ),
  1 => 
  array (
    0 => 'bar',
  ),
  2 => 
  array (
    0 => 'bar',
  ),
)

array (
  0 => 
  array (
    0 => 'foo',
  ),
  1 => 
  array (
    0 => 'bar',
  ),
)