<?php

// I have two near-identical arrays, with the only current difference being value of the "language" key - the first array's value is "en", and the second is "de"

$en = array ( '_id' => '50eda8e7f2c3777514000005', 'name' => array ( 'singular' => NULL, 'plural' => NULL, ), 'fields' => array ( 'price' => array ( 'label' => 'Preis', ), ), 'project_id' => 1, 'file' => 'test', 'language' => 'en', );

$de = array ( '_id' => '50eda8e7f2c3777514000222', 'name' => array ( 'singular' => NULL, 'plural' => NULL, ), 'fields' => array ( 'price' => array ( 'label' => 'Preis', ), ), 'project_id' => 1, 'file' => 'test', 'language' => 'de', )

// So, I want to change, delete or add ANY key in the $en array, and it must also then change in the $de array. So if I ever "price" changes in the $en array to "New Price", then this exact key must also change in the $de array to "New Price". If I delete the "plural" key in $en, it must also then be removed from $de. If I add a new key "new_key" with "new_value" as it's value in the $en array, it must also then be added correctly in the $de array.

// I only have direct access to changing the $en array myself. All changes to this must then propagate out to all other language arrays ($de is the first one, there may be $it, $fr etc...)

// These are all stored in MongoDB, but ONLY the $en array will ever be changed manually. This is why I need a coded function to perform this propagation to other language arrays automatically.

// Here is what I have so far: I need to change the "price" key to "New Price" in the $en array, and this will therefore automagically change the $de array key to "New Price". The functions I currently have may or may not be required.

// -----------------------------------------------------------------------

var_dump('EN array');
var_dump($en);
var_dump('DE array');
var_dump($de);
echo '<hr>';
// Get differences
var_dump('Differences');
$differences = arrayRecursiveDiff($en,$de);
// Remove language because that's obvious
traverseArray($differences, array('language'));
var_dump($differences);
echo '<hr>';
// Next line is the problem - array_replace_recursive() still adds the old "price" to the output. Not even sure if this is the best way of doing it.
var_dump(array_replace_recursive($en,$de,$differences['additions']));



// ---- FUNCTIONS ----
/**
 * Returns the difference between two N dimensional arrays as
 * additions, changes and deletions
 *
 * @param array $aArray1 Array to use for the search (small)
 * @param array $aArray2 Array to be searched through (large)
 * @return array array(additions,changes,deletions)
 */
function arrayRecursiveDiff(array $aArray1, array $aArray2) {

    $aReturn = array("additions"=>array(), "changes"=>array(), "deletions"=>array());

    foreach ($aArray1 as $mKey => $mValue)
    {
    if (array_key_exists($mKey, $aArray2))
    {
        if (is_array($mValue))
        {
        $aRecursiveDiff = arrayRecursiveDiff($mValue, $aArray2[$mKey]);

        foreach($aRecursiveDiff as $listKey=>$list)
        {
          if (count($list))
          {
            $aReturn[$listKey][$mKey] = $list;
          }
        }
        }
        else
        {
        if ($mValue != $aArray2[$mKey])
        {
            if(($mValue == null || $mValue == "") && is_array($aArray2[$mKey]))
            {
            $aReturn["deletions"][$mKey] = $aArray2[$mKey];
            }
            else
            {
              $aReturn["changes"][$mKey] = $mValue;
            }
        }
        }
    }
    else
    {
        $aReturn["additions"][$mKey] = $mValue;
    }
    }

    foreach ($aArray2 as $mKey => $mValue)
    {
    if (!array_key_exists($mKey, $aArray1))
    {
          $aReturn["deletions"][$mKey] = $mValue;
    }
    }

    return $aReturn;
}

// Iterates array and removes "language" key as we don't need it
function traverseArray(&$array, $keys) {
  foreach ($array as $key => &$value) {
    if (is_array($value)) {
      traverseArray($value, $keys);
    } else {
      if (in_array($key, $keys)){
    // Found the element
    // Make sure array value = two chars
    // Here we could iterate $config langs
    if(strlen($value) == 2) {
            unset($array[$key]);
    }
      }
    }
  }
}