mgd_sort_id_array()

This is the core of the sorting magic. It sorts any id-array with a specified key field.

Calling Syntax

mgd_sort_id_array (&$array, $sortkey, $object_type, $sorting)

Parameter Syntax

$array is the array to be sorted. It is passed by reference and is therefore sorted in place. It is an Array of Object IDs (read: primary keys).

$sortkey is a field of the Objects to be sorted (see below). It has to be accessible with the syntax $object->$sortkey. If you prepend this field with "reverse", the sorting order is reversed. (i.e. "abstract" and "reverse abstract" for sorting MidgardArticles.)

$object_type holds the name of the classes that have to be sorted. These classes must have an ID-Element (as do all Midgard Objects) which is used to instantinate a specific Object. References to Midgard Classes go with their real class name (i.e. "MidgardArticle" or "MidgardTopic"). Midgard Objects use "mgd_get_xxx($id)" for construction, all other objects use "new xxx($id)". See the function mgd_get_createstr() for further information.

$sorting is the SortOrder according to PHPs sort-function.

Dependencies

mgd_get_createstr()

Code


<?php



function mgd_sort_id_array (&$array, $sortkey, $object_type, 

  $sorting = SORT_REGULAR) { 

  

  $createstr = mgd_get_createstr($object_type);

  

  if (count($array) == 0) 

    return array();

  

  $sortkey = trim ($sortkey);

  $sortkey_word = explode(" ", $sortkey);

  

  switch (count ($sortkey_word)) {

    case 1:

      $reverse = false;

      break;

    

    case 2:

      if ($sortkey_word[0] != "reverse") 

        die ("mgd_sort_id_array. First Parameter of \$sortkey "

          . "($sortkey_word[0]) invalid. aborting");

      $sortkey = $sortkey_word[1];

      $reverse = true;

      

      break;

    

    default:

      die ("mgd_sort_id_array: Parameter count in \$sortkeyey "

        . "($sortkey) wrong, aborting.");

      break;

  }

  

  $sortarray = array();

  $result = array();

  

  foreach ($array as $elementid)

  {

    eval("\$tmp = $createstr($elementid);");

    $sortarray[$tmp->id] = $tmp->$sortkey;

  }

  

  asort ($sortarray, $sorting);

  reset($sortarray);

  

  while(list($key, $value) = each ($sortarray))

    $result[] = $key;

  

  $array = ($reverse) ? array_reverse($result) : $result;

}



?>