diff --git a/includes/cache.inc b/includes/cache.inc
index 2323ad4..daf5e93 100644
--- a/includes/cache.inc
+++ b/includes/cache.inc
@@ -93,63 +93,25 @@ function _views_fetch_plugin_data($type = NULL, $plugin = NULL) {
 /**
  * Scan all modules for default views and rebuild the default views cache.
  *
- * @return An associative array of all known default views.
+ * @return
+ *   For PHP > 5.0, returns a class implementing ArrayAccess. For PHP < 5.0
+ *   returns an array of all default views.
  */
-function _views_discover_default_views() {
-  static $cache = NULL;
-
-  if (!isset($cache)) {
-    $index = views_cache_get('views_default_views_index', TRUE);
-
-    // Retrieve each cached default view
-    if (isset($index->data) && is_array($index->data)) {
-      $cache = array();
-      foreach ($index->data as $view_name) {
-        $data = views_cache_get('views_default:' . $view_name, TRUE);
-        if (isset($data->data) && is_object($data->data)) {
-          $cache[$view_name] = $data->data;
-        }
-      }
-    }
-    // If missing index, rebuild the cache
-    else {
-      views_include_default_views();
-      $cache = array();
-
-      foreach(module_implements('views_default_views') as $module) {
-        $results = call_user_func($module . "_views_default_views");
-        if (!empty($results) && is_array($results)) {
-          foreach($results as $name => $view) {
-            // Only views with a sufficiently high api version are eligible.
-            if (!empty($view->api_version) && $view->api_version >= 2) {
-              // Do not cache dead handlers.
-              $view->destroy();
-              if (!isset($cache[$name])) {
-                $cache[$name] = $view;
-              }
-              else {
-                watchdog('view', "View name '@name' is already taken", array('@name' => $name), WATCHDOG_ERROR);
-              }
-            }
-          }
-        }
-      }
-
-      // Allow modules to modify default views before they are cached.
-      drupal_alter('views_default_views', $cache);
+function _views_discover_default_views($reset = FALSE) {
+  static $php5;
 
-      // Cache the index
-      $index = array_keys($cache);
-      views_cache_set('views_default_views_index', $index, TRUE);
-
-      // Cache each view
-      foreach ($cache as $name => $view) {
-        views_cache_set('views_default:' . $name, $view, TRUE);
-      }
-    }
+  // ArrayAccess is not available in PHP < 5.0. Therefore this function
+  // supports separate code paths depending on version.
+  if (!isset($php5)) {
+    $php5 = version_compare(PHP_VERSION, '5.0', '>=');
   }
-
-  return $cache;
+  if ($php5) {
+    module_load_include('inc', 'views', 'includes/php5');
+  }
+  else {
+    module_load_include('inc', 'views', 'includes/php4');
+  }
+  return _views_default_views_cache();
 }
 
 /**
diff --git a/includes/php4.inc b/includes/php4.inc
new file mode 100644
index 0000000..6da776c
--- /dev/null
+++ b/includes/php4.inc
@@ -0,0 +1,186 @@
+<?php
+/**
+ * @file PHP 4 compatibility.
+ */
+function _views_default_views_cache($reset = FALSE) {
+  static $cache = NULL;
+
+  if (!isset($cache) || $reset) {
+    $index = views_cache_get('views_default_views_index', TRUE);
+
+    // Retrieve each cached default view
+    if (!$reset && isset($index->data) && is_array($index->data)) {
+      $cache = array();
+      foreach ($index->data as $view_name) {
+        $data = views_cache_get('views_default:' . $view_name, TRUE);
+        if (isset($data->data) && is_object($data->data)) {
+          $cache[$view_name] = $data->data;
+        }
+      }
+    }
+    // If missing index, rebuild the cache
+    else {
+      views_include_default_views();
+      $cache = array();
+
+      foreach (module_implements('views_default_views') as $module) {
+        $results = call_user_func($module . "_views_default_views");
+        if (!empty($results) && is_array($results)) {
+          foreach($results as $name => $view) {
+            // Only views with a sufficiently high api version are eligible.
+            if (!empty($view->api_version) && $view->api_version >= 2) {
+              // Do not cache dead handlers.
+              $view->destroy();
+              if (!isset($cache[$name])) {
+                $cache[$name] = $view;
+              }
+              else {
+                watchdog('view', "View name '@name' is already taken", array('@name' => $name), WATCHDOG_ERROR);
+              }
+            }
+          }
+        }
+      }
+
+      // Allow modules to modify default views before they are cached.
+      drupal_alter('views_default_views', $cache);
+
+      // Cache the index
+      $index = array_keys($cache);
+      views_cache_set('views_default_views_index', $index, TRUE);
+
+      // Cache each view
+      foreach ($cache as $name => $view) {
+        views_cache_set('views_default:' . $name, $view, TRUE);
+      }
+    }
+  }
+
+  return $cache;
+}
+
+function _views_get_all_views($reset = FALSE) {
+  static $views = array();
+
+  if (empty($views) || $reset) {
+    $views = array();
+
+    // First, get all applicable views.
+    views_include('view');
+    $views = view::load_views();
+
+    // Get all default views.
+    $status = variable_get('views_defaults', array());
+
+    foreach (views_discover_default_views() as $view) {
+      // Determine if default view is enabled or disabled.
+      if (isset($status[$view->name])) {
+        $view->disabled = $status[$view->name];
+      }
+
+      // If overridden, also say so.
+      if (!empty($views[$view->name])) {
+        $views[$view->name]->type = t('Overridden');
+      }
+      else {
+        $view->type = t('Default');
+        $views[$view->name] = $view;
+      }
+    }
+
+  }
+  return $views;
+
+<?php
+/**
+ * @file PHP 4 compatibility.
+ */
+function _views_default_views_cache($reset = FALSE) {
+  static $cache = NULL;
+
+  if (!isset($cache) || $reset) {
+    $index = views_cache_get('views_default_views_index', TRUE);
+
+    // Retrieve each cached default view
+    if (!$reset && isset($index->data) && is_array($index->data)) {
+      $cache = array();
+      foreach ($index->data as $view_name) {
+        $data = views_cache_get('views_default:' . $view_name, TRUE);
+        if (isset($data->data) && is_object($data->data)) {
+          $cache[$view_name] = $data->data;
+        }
+      }
+    }
+    // If missing index, rebuild the cache
+    else {
+      views_include_default_views();
+      $cache = array();
+
+      foreach (module_implements('views_default_views') as $module) {
+        $results = call_user_func($module . "_views_default_views");
+        if (!empty($results) && is_array($results)) {
+          foreach($results as $name => $view) {
+            // Only views with a sufficiently high api version are eligible.
+            if (!empty($view->api_version) && $view->api_version >= 2) {
+              // Do not cache dead handlers.
+              $view->destroy();
+              if (!isset($cache[$name])) {
+                $cache[$name] = $view;
+              }
+              else {
+                watchdog('view', "View name '@name' is already taken", array('@name' => $name), WATCHDOG_ERROR);
+              }
+            }
+          }
+        }
+      }
+
+      // Allow modules to modify default views before they are cached.
+      drupal_alter('views_default_views', $cache);
+
+      // Cache the index
+      $index = array_keys($cache);
+      views_cache_set('views_default_views_index', $index, TRUE);
+
+      // Cache each view
+      foreach ($cache as $name => $view) {
+        views_cache_set('views_default:' . $name, $view, TRUE);
+      }
+    }
+  }
+
+  return $cache;
+}
+
+function _views_get_all_views($reset = FALSE) {
+  static $views = array();
+
+  if (empty($views) || $reset) {
+    $views = array();
+
+    // First, get all applicable views.
+    views_include('view');
+    $views = view::load_views();
+
+    // Get all default views.
+    $status = variable_get('views_defaults', array());
+
+    foreach (views_discover_default_views() as $view) {
+      // Determine if default view is enabled or disabled.
+      if (isset($status[$view->name])) {
+        $view->disabled = $status[$view->name];
+      }
+
+      // If overridden, also say so.
+      if (!empty($views[$view->name])) {
+        $views[$view->name]->type = t('Overridden');
+      }
+      else {
+        $view->type = t('Default');
+        $views[$view->name] = $view;
+      }
+    }
+
+  }
+  return $views;
+
diff --git a/includes/php5.inc b/includes/php5.inc
new file mode 100644
index 0000000..b92db70
--- /dev/null
+++ b/includes/php5.inc
@@ -0,0 +1,207 @@
+<?php
+
+/**
+ * @file Code that can only be executed in PHP 5.0 or higher.
+ */
+
+function _views_default_views_cache($reset = FALSE) {
+  static $cache;
+  if ($reset) {
+    unset($cache);
+    cache_clear_all('views_default', 'cache_views', TRUE);
+  }
+  if (!isset($cache)) {
+    $cache = new ViewsDefaultViewsCache();
+  }
+  return $cache;
+}
+
+/**
+ * Extends ArrayAcces to support lazy-loading of default views.
+ */
+class ViewsDefaultViewsCache implements ArrayAccess {
+
+  /**
+   * An array of views that were specifically requested via offsetGet() or offsetExists().
+   */
+  protected $storage = array();
+
+  /**
+   * An array of view_name => module pairs to locate views quicker when requested.
+   */
+  protected $index = array();
+
+  function __construct() {
+    // To improve lookup times for individual views, maintain an index of which
+    // module provides each view.
+    if ($cached = views_cache_get('views_default_index')) {
+      $this->index = $cached->data;
+    }
+  }
+
+  function offsetGet($offset) {
+    // If the view is cached, add it to $this->storage, this will
+    // retain the view in memory for the rest of the request.
+    if ($cached = views_cache_get('views_default:' . $offset, TRUE)) {
+      $this->storage[$offset] = $cached->data;
+      return $cached->data;
+    }
+    else {
+      // The default view exists, but is not cached.
+      return $this->resolveCacheMiss($offset);
+    }
+  }
+
+  function offsetExists($offset) {
+    return (bool) $this->offsetGet($offset);
+  }
+
+  function offsetSet($offset, $value) {
+    $this->storage[$offset] = $value;
+  }
+
+  function offsetUnset($offset) {
+    unset($this->storage[$offset]);
+  }
+
+  function resolveCacheMiss($offset) {
+    views_include_default_views();
+
+    // $this->index holds an array keyed by view_name with the module providing
+    // the view as value. There is no way to find out which view belongs to
+    // which module without iterating over all views until we find it. However
+    // since this class does not store views that were not specifically
+    // requested in memory, instead we keep an index of views and modules so
+    // that some of the iteration can be avoided when more than one view is
+    // requested on the page.
+    if (isset($this->index[$offset])) {
+      $views = views_initialize_module_views($this->index[$offset]);
+      $this->storage[$offset] = $views[$offset];
+      $view_clone = clone $views[$offset];
+      $view_clone->destroy();
+      views_cache_set('views_default:' . $offset, $view_clone, TRUE);
+      return $views[$offset];
+    }
+    else {
+      $modules = module_implements('views_default_views');
+      foreach ($modules as $module) {
+        $views = views_initialize_module_views($module);
+        foreach ($views as $key => $view) {
+          $this->index[$key] = $module;
+          if ($key == $offset) {
+            $this->storage[$offset] = $view;
+            $return = $view;
+            $view_clone = clone $view;
+            $view_clone->destroy();
+            views_cache_set('views_default:' . $offset, $view_clone, TRUE);
+            // Do not break or return here. This allows all views provided
+            // by a module to be indexed so that subsequent lookups for views
+            // provided by the same module do not require foreaching again.
+          }
+        }
+        // If another process is also building the index, it may have more
+        // items than this request has accumulated. Compare before overwriting.
+        $cached = views_cache_get('views_default_index');
+        if (!$cached || (count($cached->data) <= count($this->index))) {
+          views_cache_set('views_default_index', $this->index);
+        }
+
+        if (!empty($return)) {
+          return $return;
+        }
+      }
+      // If no view was eligible, cache FALSE.
+      $this->storage[$offset] = FALSE;
+      views_cache_set('views_default:' . $offset, FALSE, TRUE);
+    }
+  }
+}
+
+function _views_get_all_views($reset = FALSE) {
+  return new ViewsAllViews();
+}
+
+class ViewsAllViews implements Iterator {
+  protected $views = array();
+  protected $dbViews = array();
+  protected $modules;
+
+  public function __construct() {
+    views_include_default_views();
+    $this->modules = module_implements('views_default_views');
+    views_include('view');
+    $this->dbViews = view::load_views();
+    // Populate each view from the database with default/overriden.
+    foreach ($this->dbViews as $key => $view) {
+      $this->dbViews[$key] = views_get_view($key);
+    }
+    $this->views = $this->dbViews;
+  }
+
+  function rewind() {
+    $this->views = $this->dbViews;
+    $module = reset($this->modules);
+    $default_views = views_initialize_module_views($module);
+    foreach ($default_views as $key => $view) {
+      if (!isset($this->dbViews[$key])) {
+        $this->views[$key] = $view;
+      }
+    }
+  }
+
+  function current() {
+    return current($this->views);
+  }
+
+  function key() {
+    return key($this->views);
+  }
+
+  function next() {
+    if (!next($this->views) && $module = next($this->modules)) {
+      $this->views = views_initialize_module_views($module);
+      // Don't iterate over views that have already been returned from the
+      // database.
+      foreach ($this->views as $key => $view) {
+        if (isset($this->dbViews[$key])) {
+          unset($this->views[$key]);
+        }
+      }
+      reset($this->views);
+      // There is a possibility that the module provides no default views
+      // or that all the views have been overridden. If this is the case
+      // call the function recursively to get to the next one.
+      if (empty($this->views)) {
+        $this->next();
+      }
+    }
+  }
+
+  function valid() {
+    return (bool) current($this->views);
+  }
+}
+
+/**
+ * Initialize views for a module.
+ *
+ * @param $module
+ *   A module that implements hook_default_views().
+ *
+ * @return
+ *   An array of default views provided by the module.
+ */
+function views_initialize_module_views($module) {
+  $views = array();
+  $function = $module . '_views_default_views';
+  $result = $function();
+  if ($result) {
+    drupal_alter('views_default_views', $result);
+    foreach ($result as $key => $view) {
+      if (!empty($view->api_version) && $view->api_version >= 2) {
+        $views[$key] = $view;
+      }
+    }
+  }
+  return $views;
+}
diff --git a/views.module b/views.module
index 4a587f4..19e31c1 100644
--- a/views.module
+++ b/views.module
@@ -747,7 +747,7 @@ function views_get_plugin($type, $plugin) {
  * @return
  *   A view object or NULL if it is not available.
  */
-function &views_get_default_view($view_name) {
+function views_get_default_view($view_name) {
   $null = NULL;
 
   // Attempt to load individually cached view from cache.
@@ -854,36 +854,20 @@ function views_get_applicable_views($type) {
  *   If TRUE, reset the static cache forcing views to be reloaded.
  */
 function views_get_all_views($reset = FALSE) {
-  static $views = array();
-
-  if (empty($views) || $reset) {
-    $views = array();
-
-    // First, get all applicable views.
-    views_include('view');
-    $views = view::load_views();
-
-    // Get all default views.
-    $status = variable_get('views_defaults', array());
-
-    foreach (views_discover_default_views() as $view) {
-      // Determine if default view is enabled or disabled.
-      if (isset($status[$view->name])) {
-        $view->disabled = $status[$view->name];
-      }
-
-      // If overridden, also say so.
-      if (!empty($views[$view->name])) {
-        $views[$view->name]->type = t('Overridden');
-      }
-      else {
-        $view->type = t('Default');
-        $views[$view->name] = $view;
-      }
-    }
+  static $php5;
 
+  // ArrayObject is not available in PHP < 5.0. Therefore this function
+  // supports separate code paths depending on version.
+  if (!isset($php5)) {
+    $php5 = version_compare(PHP_VERSION, '5.0', '>=');
+  }
+  if ($php5) {
+    module_load_include('inc', 'views', 'includes/php5');
+  }
+  else {
+    module_load_include('inc', 'views', 'includes/php4');
   }
-  return $views;
+  return _views_get_all_views();
 }
 
 /**