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+<?php
+
+# CATS Online Registration System
+# Copyright (C) 2004 Adam Beaumont, Thomas Cort, Patrick McLean, Scott Stoddard
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+
+# A sort that we use with the actor class. It allows us to sort by priority
+function priority_sort($a,$b) {
+   if ($a->get_priority() == $b->get_priority()) {
+       return 0;
+   }
+   return ($a->get_priority() < $b->get_priority()) ? -1 : 1;
+}
+
+# General Collection Class
+class collection {
+  var $items;
+
+  # $key should be a string
+  # $value should be an actor
+  function put($key,$value) {
+    if (isset($this->items[$key])) {
+      $this->items[$key][count($this->items[$key])] = $value;
+      uasort($this->items[$key],"priority_sort");
+    } else {
+      $this->items[$key] = array($value);
+    }
+  }
+
+  # get will return an array of actors or false
+  # You _MUST_ use php's iterator each() to access to elements in order
+  # indexing them 0,1,...,n-1 will not work because sorting != re-indexing
+  # There is a working example of this class at the bottom of this file...
+  function get($key) {
+    if (isset($this->items[$key])) {
+      return $this->items[$key];
+    } else {
+      return false;
+    }
+  }
+}
+
+# Example Code using class collection.
+#
+# $col = new collection();
+# include("event_handler.class.php");
+#
+# $one = new event_handler();
+# $two = new event_handler();
+# $thr = new event_handler();
+#
+# $one->set_priority(1);
+# $two->set_priority(2);
+# $thr->set_priority(3);
+#
+# $one->set_name("one");
+# $two->set_name("two");
+# $thr->set_name("thr");
+#
+# $col->put("event_name",$thr); # 3
+# $col->put("event_name",$one); # 1
+# $col->put("event_name",$two); # 2
+#
+# $x = $col->get("event_name");
+# while (list($key, $value) = each($x)) {
+#   echo $x[$key]->get_priority();
+#   echo " ";
+# }
+# echo "\n";
+?>