Index: modules/comment/comment.module
===================================================================
RCS file: /cvs/drupal/drupal/modules/comment/comment.module,v
retrieving revision 1.673
diff -u -p -r1.673 comment.module
--- modules/comment/comment.module	20 Dec 2008 18:24:35 -0000	1.673
+++ modules/comment/comment.module	24 Dec 2008 15:57:43 -0000
@@ -484,7 +484,7 @@ function comment_nodeapi_view($node, $te
         }
       }
     }
-    
+
     if (isset($links['comment_forbidden'])) {
       $links['comment_forbidden']['html'] = TRUE;
     }
@@ -1248,7 +1248,7 @@ function comment_validate($edit) {
       form_set_error('date', t('You have to specify a valid date.'));
     }
   }
-  if (isset($edit['author']) && !$account = user_load(array('name' => $edit['author']))) {
+  if (isset($edit['author']) && !$account = user_load_by_name($edit['author'])) {
     form_set_error('author', t('You have to specify a valid author.'));
   }
 
@@ -1572,7 +1572,7 @@ function comment_form_add_preview($form,
 
     // Attach the user and time information.
     if (!empty($edit['author'])) {
-      $account = user_load(array('name' => $edit['author']));
+      $account = user_load_by_name($edit['author']);
     }
     elseif ($user->uid && !isset($edit['is_anonymous'])) {
       $account = $user;
@@ -1652,7 +1652,7 @@ function _comment_form_submit(&$comment_
 
   $comment_values['timestamp'] = strtotime($comment_values['date']);
   if (isset($comment_values['author'])) {
-    $account = user_load(array('name' => $comment_values['author']));
+    $account = user_load_by_name($comment_values['author']);
     $comment_values['uid'] = $account->uid;
     $comment_values['name'] = $comment_values['author'];
   }
Index: modules/dblog/dblog.test
===================================================================
RCS file: /cvs/drupal/drupal/modules/dblog/dblog.test,v
retrieving revision 1.13
diff -u -p -r1.13 dblog.test
--- modules/dblog/dblog.test	24 Dec 2008 10:38:41 -0000	1.13
+++ modules/dblog/dblog.test	24 Dec 2008 15:57:43 -0000
@@ -188,7 +188,7 @@ class DBLogTestCase extends DrupalWebTes
     $this->drupalPost('admin/user/user/create', $edit, t('Create new account'));
     $this->assertResponse(200);
     // Retrieve user object.
-    $user = user_load(array('name' => $name)); //, 'pass' => $pass, 'status' => 1));
+    $user = user_load_by_name($name); //, 'pass' => $pass, 'status' => 1));
     $this->assertTrue($user != null, t('User @name was loaded', array('@name' => $name)));
     $user->pass_raw = $pass; // Needed by drupalLogin.
     // Login user.
Index: modules/node/node.module
===================================================================
RCS file: /cvs/drupal/drupal/modules/node/node.module,v
retrieving revision 1.1004
diff -u -p -r1.1004 node.module
--- modules/node/node.module	20 Dec 2008 18:24:38 -0000	1.1004
+++ modules/node/node.module	24 Dec 2008 15:57:47 -0000
@@ -926,7 +926,7 @@ function node_validate($node, $form = ar
 
   if (user_access('administer nodes')) {
     // Validate the "authored by" field.
-    if (!empty($node->name) && !($account = user_load(array('name' => $node->name)))) {
+    if (!empty($node->name) && !($account = user_load_by_name($node->name))) {
       // The use of empty() is mandatory in the context of usernames
       // as the empty string denotes the anonymous user. In case we
       // are dealing with an anonymous user we set the user ID to 0.
@@ -973,7 +973,7 @@ function node_submit($node) {
 
   if (user_access('administer nodes')) {
     // Populate the "authored by" field.
-    if ($account = user_load(array('name' => $node->name))) {
+    if ($account = user_load_by_name($node->name)) {
       $node->uid = $account->uid;
     }
     else {
@@ -1204,7 +1204,7 @@ function node_build_content($node, $teas
 
   // Allow modules to make their own additions to the node.
   node_invoke_nodeapi($node, 'view', $teaser, $page);
-  
+
   // Allow modules to modify the structured node.
   drupal_alter('node_view', $node, $teaser, $page);
 
@@ -2995,7 +2995,7 @@ function node_list_permissions($type) {
  */
 function node_elements() {
   $type['node_links'] = array();
-  
+
   return $type;
 }
 
Index: modules/node/node.pages.inc
===================================================================
RCS file: /cvs/drupal/drupal/modules/node/node.pages.inc,v
retrieving revision 1.47
diff -u -p -r1.47 node.pages.inc
--- modules/node/node.pages.inc	16 Dec 2008 22:05:51 -0000	1.47
+++ modules/node/node.pages.inc	24 Dec 2008 15:57:47 -0000
@@ -348,7 +348,7 @@ function node_preview($node) {
     if (isset($node->name)) {
       // The use of isset() is mandatory in the context of user IDs, because
       // user ID 0 denotes the anonymous user.
-      if ($user = user_load(array('name' => $node->name))) {
+      if ($user = user_load_by_name($node->name)) {
         $node->uid = $user->uid;
         $node->picture = $user->picture;
       }
@@ -357,7 +357,7 @@ function node_preview($node) {
       }
     }
     elseif ($node->uid) {
-      $user = user_load(array('uid' => $node->uid));
+      $user = user_load($node->uid);
       $node->name = $user->name;
       $node->picture = $user->picture;
     }
Index: modules/profile/profile.module
===================================================================
RCS file: /cvs/drupal/drupal/modules/profile/profile.module,v
retrieving revision 1.248
diff -u -p -r1.248 profile.module
--- modules/profile/profile.module	16 Dec 2008 23:57:33 -0000	1.248
+++ modules/profile/profile.module	24 Dec 2008 15:57:47 -0000
@@ -203,13 +203,6 @@ function profile_block_view($delta = '')
 }
 
 /**
- * Implementation of hook_user_load().
- */
-function profile_user_load(&$edit, &$user, $category = NULL) {
-  return profile_load_profile($user);
-}
-
-/**
  * Implementation of hook_user_register().
  */
 function profile_user_register(&$edit, &$user, $category = NULL) {
@@ -265,11 +258,14 @@ function profile_user_delete(&$edit, &$u
   db_query('DELETE FROM {profile_value} WHERE uid = %d', $user->uid);
 }
 
-function profile_load_profile(&$user) {
-  $result = db_query('SELECT f.name, f.type, v.value FROM {profile_field} f INNER JOIN {profile_value} v ON f.fid = v.fid WHERE uid = %d', $user->uid);
-  while ($field = db_fetch_object($result)) {
-    if (empty($user->{$field->name})) {
-      $user->{$field->name} = _profile_field_serialize($field->type) ? unserialize($field->value) : $field->value;
+/**
+ * Implementation of hook_user_load().
+ */
+function profile_user_load($users) {
+  $result = db_query('SELECT f.name, f.type, v.uid, v.value FROM {profile_field} f INNER JOIN {profile_value} v ON f.fid = v.fid WHERE uid IN (:uids)', array(':uids' => array_keys($users)));
+  foreach ($result as $record) {
+    if (empty($users[$record->uid]->{$record->name})) {
+      $users[$record->uid]->{$record->name} = _profile_field_serialize($record->type) ? unserialize($record->value) : $record->value;
     }
   }
 }
@@ -336,7 +332,7 @@ function profile_view_field($user, $fiel
 
 function profile_view_profile(&$user) {
 
-  profile_load_profile($user);
+  $user = user_load($user->uid);
 
   // Show private fields to administrators and people viewing their own account.
   if (user_access('administer users') || $GLOBALS['user']->uid == $user->uid) {
Index: modules/profile/profile.pages.inc
===================================================================
RCS file: /cvs/drupal/drupal/modules/profile/profile.pages.inc,v
retrieving revision 1.10
diff -u -p -r1.10 profile.pages.inc
--- modules/profile/profile.pages.inc	5 Dec 2008 12:50:28 -0000	1.10
+++ modules/profile/profile.pages.inc	24 Dec 2008 15:57:47 -0000
@@ -55,11 +55,13 @@ function profile_browse() {
     }
 
     // Extract the affected users:
-    $result = pager_query("SELECT u.uid, u.access FROM {users} u INNER JOIN {profile_value} v ON u.uid = v.uid WHERE v.fid = %d AND $query AND u.access != 0 AND u.status != 0 ORDER BY u.access DESC", 20, 0, NULL, $arguments);
+    $result = pager_query("SELECT u.uid, u.access FROM {users} u INNER JOIN {profile_value} v ON u.uid = v.uid WHERE v.fid = %d AND $query AND u.access != 0 AND u.status != 0 ORDER BY u.access DESC", 20, 0, NULL, $arguments)->fetchAllAssoc('uid');
+ 
+    // Load the users.
+    $users = user_load_multiple(array_keys($result));
 
     $content = '';
-    while ($account = db_fetch_object($result)) {
-      $account = user_load(array('uid' => $account->uid));
+    foreach ($users as $account) {
       $profile = _profile_update_user_fields($fields, $account);
       $content .= theme('profile_listing', $account, $profile);
     }
@@ -88,11 +90,10 @@ function profile_browse() {
     }
 
     // Extract the affected users:
-    $result = pager_query('SELECT uid, access FROM {users} WHERE uid > 0 AND status != 0 AND access != 0 ORDER BY access DESC', 20, 0, NULL);
-
+    $result = pager_query('SELECT uid, access FROM {users} WHERE uid > 0 AND status != 0 AND access != 0 ORDER BY access DESC', 20, 0, NULL)->fetchAllAssoc('uid');
+    $users = user_load_multiple(array_keys($result));
     $content = '';
-    while ($account = db_fetch_object($result)) {
-      $account = user_load(array('uid' => $account->uid));
+    foreach ($users as $account) {
       $profile = _profile_update_user_fields($fields, $account);
       $content .= theme('profile_listing', $account, $profile);
     }
Index: modules/simpletest/drupal_web_test_case.php
===================================================================
RCS file: /cvs/drupal/drupal/modules/simpletest/drupal_web_test_case.php,v
retrieving revision 1.76
diff -u -p -r1.76 drupal_web_test_case.php
--- modules/simpletest/drupal_web_test_case.php	20 Dec 2008 18:24:39 -0000	1.76
+++ modules/simpletest/drupal_web_test_case.php	24 Dec 2008 15:57:48 -0000
@@ -824,7 +824,7 @@ class DrupalWebTestCase {
     // Log in with a clean $user.
     $this->originalUser = $user;
     drupal_save_session(FALSE);
-    $user = user_load(array('uid' => 1));
+    $user = user_load(1);
 
     // Restore necessary variables.
     variable_set('install_profile', 'default');
Index: modules/simpletest/tests/file.test
===================================================================
RCS file: /cvs/drupal/drupal/modules/simpletest/tests/file.test,v
retrieving revision 1.14
diff -u -p -r1.14 file.test
--- modules/simpletest/tests/file.test	27 Nov 2008 08:41:45 -0000	1.14
+++ modules/simpletest/tests/file.test	24 Dec 2008 15:57:49 -0000
@@ -259,7 +259,7 @@ class FileValidatorTest extends DrupalWe
     drupal_save_session(FALSE);
 
     // Run these test as uid = 1.
-    $user = user_load(array('uid' => 1));
+    $user = user_load(1);
 
     $file = new stdClass();
     $file->filesize = 999999;
Index: modules/statistics/statistics.pages.inc
===================================================================
RCS file: /cvs/drupal/drupal/modules/statistics/statistics.pages.inc,v
retrieving revision 1.6
diff -u -p -r1.6 statistics.pages.inc
--- modules/statistics/statistics.pages.inc	13 Oct 2008 00:33:04 -0000	1.6
+++ modules/statistics/statistics.pages.inc	24 Dec 2008 15:57:49 -0000
@@ -40,7 +40,7 @@ function statistics_node_tracker() {
 }
 
 function statistics_user_tracker() {
-  if ($account = user_load(array('uid' => arg(1)))) {
+  if ($account = user_load(arg(1))) {
 
     $header = array(
         array('data' => t('Timestamp'), 'field' => 'timestamp', 'sort' => 'desc'),
Index: modules/system/system.module
===================================================================
RCS file: /cvs/drupal/drupal/modules/system/system.module,v
retrieving revision 1.653
diff -u -p -r1.653 system.module
--- modules/system/system.module	24 Dec 2008 09:59:22 -0000	1.653
+++ modules/system/system.module	24 Dec 2008 15:57:52 -0000
@@ -1972,7 +1972,7 @@ function system_send_email_action($objec
 
   if (isset($node)) {
     if (!isset($account)) {
-      $account = user_load(array('uid' => $node->uid));
+      $account = user_load($node->uid);
     }
     if ($recipient == '%author') {
       $recipient = $account->mail;
Index: modules/trigger/trigger.module
===================================================================
RCS file: /cvs/drupal/drupal/modules/trigger/trigger.module,v
retrieving revision 1.24
diff -u -p -r1.24 trigger.module
--- modules/trigger/trigger.module	18 Dec 2008 23:07:50 -0000	1.24
+++ modules/trigger/trigger.module	24 Dec 2008 15:57:52 -0000
@@ -195,7 +195,7 @@ function _trigger_normalize_node_context
     // An action that works on users is being called in a node context.
     // Load the user object of the node's author.
     case 'user':
-      return user_load(array('uid' => $node->uid));
+      return user_load($node->uid);
   }
 }
 
@@ -298,7 +298,7 @@ function _trigger_normalize_comment_cont
 
     // An action that works on users is being called in a comment context.
     case 'user':
-      return user_load(array('uid' => is_array($comment) ? $comment['uid'] : $comment->uid));
+      return user_load(is_array($comment) ? $comment['uid'] : $comment->uid);
   }
 }
 
Index: modules/update/update.fetch.inc
===================================================================
RCS file: /cvs/drupal/drupal/modules/update/update.fetch.inc,v
retrieving revision 1.13
diff -u -p -r1.13 update.fetch.inc
--- modules/update/update.fetch.inc	24 Oct 2008 19:23:59 -0000	1.13
+++ modules/update/update.fetch.inc	24 Dec 2008 15:57:52 -0000
@@ -122,7 +122,7 @@ function _update_cron_notify() {
     if (!empty($notify_list)) {
       $default_language = language_default();
       foreach ($notify_list as $target) {
-        if ($target_user = user_load(array('mail' => $target))) {
+        if ($target_user = user_load_by_mail($target)) {
           $target_language = user_preferred_language($target_user);
         }
         else {
Index: modules/user/user.api.php
===================================================================
RCS file: /cvs/drupal/drupal/modules/user/user.api.php,v
retrieving revision 1.1
diff -u -p -r1.1 user.api.php
--- modules/user/user.api.php	25 Nov 2008 02:37:33 -0000	1.1
+++ modules/user/user.api.php	24 Dec 2008 15:57:53 -0000
@@ -86,6 +86,25 @@ function hook_user($op, &$edit, &$accoun
     return $form;
   }
 }
+/**
+ * Act on user objects when loaded from the database.
+ *
+ * Due to the static cache in user_load_multiple() you should not use this
+ * hook to modify the user properties returned by the {users} table itself
+ * since this may result in unreliable results when loading from cache.
+ *
+ * @param $users
+ *   An array of user objects, indexed by uid.
+ *
+ * @see user_load_multiple()
+ * @see profile_user_load()
+ */
+function hook_user_load($users) {
+  $result = db_query('SELECT * FROM {my_table} WHERE uid IN (:uids)', array(':uids' => array_keys($users)));
+  foreach ($result as $record) {
+    $users[$record->uid]->foo = $result->foo;
+  }
+}
 
 /**
  * Add mass user operations.
Index: modules/user/user.module
===================================================================
RCS file: /cvs/drupal/drupal/modules/user/user.module,v
retrieving revision 1.949
diff -u -p -r1.949 user.module
--- modules/user/user.module	23 Dec 2008 14:18:31 -0000	1.949
+++ modules/user/user.module	24 Dec 2008 15:57:55 -0000
@@ -133,65 +133,191 @@ function user_external_login($account, $
 }
 
 /**
- * Fetch a user object.
- *
- * @param $array
- *   An associative array of attributes to search for in selecting the
- *   user, such as user name or e-mail address.
+ * Load multiple users based on certain conditions.
  *
+ * This function should be used whenever you need to load more than one user
+ * from the database. Users are loaded into memory and will not require
+ * database access if loaded again during the same page request.
+ *
+ * @param $uids
+ *   An array of user IDs.
+ * @param $conditions
+ *   An array of conditions to match against the {users} table. These
+ *   should be supplied in the form array('field_name' => 'field_value').
+ * @param $reset
+ *   A boolean indicating that the internal cache should be reset.
  * @return
- *   A fully-loaded $user object upon successful user load or FALSE if user
- *   cannot be loaded.
+ *   An array of user objects, indexed by uid.
+ *
+ * @see user_load()
+ * @see user_load_by_mail()
+ * @see user_load_by_name()
  */
-function user_load($array = array()) {
-  // Dynamically compose a SQL query:
-  $query = array();
-  $params = array();
-
-  if (is_numeric($array)) {
-    $array = array('uid' => $array);
-  }
-  elseif (!is_array($array)) {
-    return FALSE;
-  }
-
-  foreach ($array as $key => $value) {
-    if ($key == 'uid' || $key == 'status') {
-      $query[] = "$key = %d";
-      $params[] = $value;
-    }
-    elseif ($key == 'pass') {
-      $query[] = "pass = '%s'";
-      $params[] = $value;
+function user_load_multiple($uids = array(), $conditions = array(), $reset = FALSE) {
+  static $user_cache = array();
+  if ($reset) {
+    $user_cache = array();
+  }
+
+  $users = array();
+
+  // Create a new variable which is either a prepared version of the $uids
+  // array for later comparison with the user cache, or FALSE if no $uids were
+  // passed. The $uids array is reduced as items are loaded from cache, and we
+  // need to know if it's empty for this reason to avoid querying the database
+  // when all requested users are loaded from cache.
+  $passed_uids = !empty($uids) ? array_flip($uids) : FALSE;
+
+  // Load any available users from the internal cache.
+  if ($user_cache) {
+    if ($uids) {
+      $users += array_intersect_key($user_cache, $passed_uids);
+      // If any users were loaded, remove them from the $uids still to load.
+      $uids = array_keys(array_diff_key($passed_uids, $users));
     }
-    else {
-      $query[]= "LOWER($key) = LOWER('%s')";
-      $params[] = $value;
+    // If only conditions is passed, load all users from the cache. Users
+    // which don't match conditions will be removed later.
+    elseif ($conditions) {
+      $users = $user_cache;
+    }
+  }
+
+  // Remove any loaded users from the array if they don't match $conditions.
+  if ($conditions) {
+    foreach ($users as $user) {
+      $user_values = (array) $user;
+      if (isset($conditions['name']) && drupal_strtolower($conditions['name']) != drupal_strtolower($user_values['name'])) {
+        unset($users[$user->uid]);
+      }
+      if (isset($conditions['mail']) && drupal_strtolower($conditions['mail']) != drupal_strtolower($user_values['mail'])) {
+        unset($users[$user->uid]);
+      }
+      elseif (array_diff_assoc($conditions, $user_values)) {
+        unset($users[$user->uid]);
+      }
     }
   }
-  $result = db_query('SELECT * FROM {users} u WHERE ' . implode(' AND ', $query), $params);
 
-  if ($user = db_fetch_object($result)) {
-    $user = drupal_unpack($user);
+  // Load any remaining users from the database, this is necessary if we have
+  // $uids still to load, or if $conditions was passed without $uids.
+  if ($uids || ($conditions && !$passed_uids)) {
+    $query = db_select('users', 'u')->fields('u');
 
-    $user->roles = array();
-    if ($user->uid) {
-      $user->roles[DRUPAL_AUTHENTICATED_RID] = 'authenticated user';
+    // If the $uids array is populated, add those to the query.
+    if ($uids) {
+      $query->condition('u.uid', $uids, 'IN');
     }
-    else {
-      $user->roles[DRUPAL_ANONYMOUS_RID] = 'anonymous user';
+    // If the conditions array is populated, add those to the query.
+    if ($conditions) {
+      // Using LIKE() to get a case insensitive comparison because Crell and
+      // chx promise that dbtng will map it to ILIKE in postgres.
+      if (isset($conditions['name'])) {
+        $query->condition('u.name', $conditions['name'], 'LIKE');
+        unset($conditions['name']);
+      }
+      if (isset($conditions['mail'])) {
+        $query->condition('u.mail', $conditions['mail'], 'LIKE');
+        unset($conditions['mail']);
+      }
+      foreach ($conditions as $field => $value) {
+        $query->condition('u.' . $field, $value);
+      }
     }
-    $result = db_query('SELECT r.rid, r.name FROM {role} r INNER JOIN {users_roles} ur ON ur.rid = r.rid WHERE ur.uid = %d', $user->uid);
-    while ($role = db_fetch_object($result)) {
-      $user->roles[$role->rid] = $role->name;
+    $result = $query->execute();
+
+    $queried_users = array();
+    foreach ($result as $record) {
+      $queried_users[$record->uid] = drupal_unpack($record);
+      $queried_users[$record->uid]->roles = array();
+      if ($record->uid) {
+        $queried_users[$record->uid]->roles[DRUPAL_AUTHENTICATED_RID] = 'authenticated user';
+      }
+      else {
+        $queried_users[$record->uid]->roles[DRUPAL_ANONYMOUS_RID] = 'anonymous user';
+      }
+    }
+
+    if (!empty($queried_users)) {
+      // Add any additional roles from the database.
+      $result = db_query('SELECT r.rid, r.name, ur.uid FROM {role} r INNER JOIN {users_roles} ur ON ur.rid = r.rid WHERE ur.uid IN (:uids)', array(':uids' => array_keys($queried_users)));
+      foreach ($result as $record) {
+        $queried_users[$record->uid]->roles[$record->rid] = $record->name;
+      }
+
+      // Invoke hook_user_load() on the users loaded from the database
+      // and add them to the static cache.
+      foreach (module_implements('user_load') as $module) {
+        $function = $module . '_user_load';
+        $function($queried_users);
+      }
+      $users += $queried_users;
+      $user_cache += $queried_users;
     }
-    user_module_invoke('load', $array, $user);
   }
-  else {
-    $user = FALSE;
+
+  // Ensure that the returned array is ordered the same as the original $uids
+  // array if this was passed in and remove any invalid uids.
+  if ($passed_uids) {
+    // Remove any invalid uids from the array.
+    $passed_uids = array_intersect_key($passed_uids, $users);
+    foreach ($users as $user) {
+      $passed_uids[$user->uid] = $user;
+    }
+    $users = $passed_uids;
   }
 
-  return $user;
+  return $users;
+}
+
+
+/**
+ * Fetch a user object.
+ *
+ * @param $uid
+ *   Integer specifying the user id.
+ * @param $reset
+ *   A boolean indicating that the internal cache should be reset.
+ * @return
+ *   A fully-loaded $user object upon successful user load or FALSE if user
+ *   cannot be loaded.
+ *
+ * @see user_load_multiple()
+ */
+function user_load($uid, $reset = FALSE) {
+  $users = user_load_multiple(array($uid), array(), $reset);
+  return reset($users);
+}
+
+/**
+ * Fetch a user object by email address.
+ *
+ * @param $mail
+ *   String with the account's e-mail address.
+ * @return
+ *   A fully-loaded $user object upon successful user load or FALSE if user
+ *   cannot be loaded.
+ *
+ * @see user_load_multiple()
+ */
+function user_load_by_mail($mail) {
+  $users = user_load_multiple(array(), array('mail' => $mail));
+  return reset($users);
+}
+
+/**
+ * Fetch a user object by account name.
+ *
+ * @param $name
+ *   String with the account's user name.
+ * @return
+ *   A fully-loaded $user object upon successful user load or FALSE if user
+ *   cannot be loaded.
+ *
+ * @see user_load_multiple()
+ */
+function user_load_by_name($name) {
+  $users = user_load_multiple(array(), array('name' => $name));
+  return reset($users);
 }
 
 /**
@@ -288,7 +414,7 @@ function user_save($account, $edit = arr
     }
 
     // Refresh user object.
-    $user = user_load(array('uid' => $account->uid));
+    $user = user_load($account->uid, TRUE);
 
     // Send emails after we have the new user object.
     if (isset($edit['status']) && $edit['status'] != $account->status) {
@@ -318,7 +444,7 @@ function user_save($account, $edit = arr
     }
 
     // Build the initial user object.
-    $user = user_load(array('uid' => $edit['uid']));
+    $user = user_load($edit['uid']);
 
     user_module_invoke('insert', $edit, $user, $category);
 
@@ -346,7 +472,7 @@ function user_save($account, $edit = arr
     }
 
     // Build the finished user object.
-    $user = user_load(array('uid' => $edit['uid']));
+    $user = user_load($edit['uid'], TRUE);
   }
 
   return $user;
@@ -1361,8 +1487,8 @@ function user_authenticate($form_values 
              db_query("UPDATE {users} SET pass = '%s' WHERE uid = %d", $new_hash, $account->uid);
            }
         }
-        $account = user_load(array('uid' => $account->uid, 'status' => 1));
-        $user = $account;
+        $users = user_load_multiple(array($account->uid), array('status' => '1'));
+        $user = reset($users);
         user_authenticate_finalize($form_values);
         return $user;
       }
@@ -1415,7 +1541,7 @@ function user_login_submit($form, &$form
 function user_external_login_register($name, $module) {
   global $user;
 
-  $existing_user = user_load(array('name' => $name));
+  $existing_user = user_load_by_name($name);
   if (isset($existing_user->uid)) {
     $user = $existing_user;
   }
@@ -1601,7 +1727,7 @@ function _user_edit_submit($account, &$e
  * @param $uid The user ID of the user to delete.
  */
 function user_delete($edit, $uid) {
-  $account = user_load(array('uid' => $uid));
+  $account = user_load($uid);
   drupal_session_destroy_uid($uid);
   _user_mail_notify('status_deleted', $account);
   module_invoke_all('user_delete', $edit, $account);
@@ -1813,7 +1939,7 @@ function user_user_operations($form_stat
  */
 function user_user_operations_unblock($accounts) {
   foreach ($accounts as $uid) {
-    $account = user_load(array('uid' => (int)$uid));
+    $account = user_load($uid);
     // Skip unblocking user if they are already unblocked.
     if ($account !== FALSE && $account->status == 0) {
       user_save($account, array('status' => 1));
@@ -1826,7 +1952,7 @@ function user_user_operations_unblock($a
  */
 function user_user_operations_block($accounts) {
   foreach ($accounts as $uid) {
-    $account = user_load(array('uid' => (int)$uid));
+    $account = user_load($uid);
     // Skip blocking user if they are already blocked.
     if ($account !== FALSE && $account->status == 1) {
       user_save($account, array('status' => 0));
@@ -1845,7 +1971,7 @@ function user_multiple_role_edit($accoun
   switch ($operation) {
     case 'add_role':
       foreach ($accounts as $uid) {
-        $account = user_load(array('uid' => (int)$uid));
+        $account = user_load($uid);
         // Skip adding the role to the user if they already have it.
         if ($account !== FALSE && !isset($account->roles[$rid])) {
           $roles = $account->roles + array($rid => $role_name);
@@ -1855,7 +1981,7 @@ function user_multiple_role_edit($accoun
       break;
     case 'remove_role':
       foreach ($accounts as $uid) {
-        $account = user_load(array('uid' => (int)$uid));
+        $account = user_load($uid);
         // Skip removing the role from the user if they already don't have it.
         if ($account !== FALSE && isset($account->roles[$rid])) {
           $roles = array_diff($account->roles, array($rid => $role_name));
Index: modules/user/user.pages.inc
===================================================================
RCS file: /cvs/drupal/drupal/modules/user/user.pages.inc,v
retrieving revision 1.24
diff -u -p -r1.24 user.pages.inc
--- modules/user/user.pages.inc	24 Nov 2008 00:40:45 -0000	1.24
+++ modules/user/user.pages.inc	24 Dec 2008 15:57:55 -0000
@@ -44,10 +44,12 @@ function user_pass() {
 function user_pass_validate($form, &$form_state) {
   $name = trim($form_state['values']['name']);
   // Try to load by email.
-  $account = user_load(array('mail' => $name, 'status' => 1));
+  $users = user_load_multiple(array(), array('mail' => $name, 'status' => '1'));
+  $account = reset($users);
   if (!$account) {
     // No success, try to load by name.
-    $account = user_load(array('name' => $name, 'status' => 1));
+    $users = user_load_multiple(array(), array('name' => $name, 'status' => '1'));
+    $account = reset($users);
   }
   if (isset($account->uid)) {
     form_set_value(array('#parents' => array('account')), $account, $form_state);
@@ -86,7 +88,8 @@ function user_pass_reset(&$form_state, $
     $timeout = 86400;
     $current = REQUEST_TIME;
     // Some redundant checks for extra security ?
-    if ($timestamp < $current && $account = user_load(array('uid' => $uid, 'status' => 1)) ) {
+    $users = user_load_multiple(array($uid), array('status' => '1'));
+    if ($timestamp < $current && $account = reset($users)) {
       // No time out for first time login.
       if ($account->login && $current - $timestamp > $timeout) {
         drupal_set_message(t('You have tried to use a one-time login link that has expired. Please request a new one using the form below.'));
Index: modules/user/user.test
===================================================================
RCS file: /cvs/drupal/drupal/modules/user/user.test,v
retrieving revision 1.23
diff -u -p -r1.23 user.test
--- modules/user/user.test	16 Dec 2008 23:57:33 -0000	1.23
+++ modules/user/user.test	24 Dec 2008 15:57:56 -0000
@@ -31,7 +31,8 @@ class UserRegistrationTestCase extends D
     $this->assertText(t('Your password and further instructions have been sent to your e-mail address.'), t('User registered successfully.'));
 
     // Check database for created user.
-    $user = user_load($edit);
+    $users = user_load_multiple(array(), array('name' => $name, 'mail' => $mail));
+    $user = reset($users);
     $this->assertTrue($user, t('User found in database.'));
     $this->assertTrue($user->uid > 0, t('User has valid user id.'));
 
@@ -53,9 +54,12 @@ class UserRegistrationTestCase extends D
     $edit['pass'] = 'foo';
     $this->drupalPost('user', $edit, t('Log in'));
     $this->assertText(t('Sorry, unrecognized username or password. Have you forgotten your password?'), t('Invalid login attempt failed.'));
+$this->assertTrue(1, var_export($edit, 1));
+$this->assertTrue(1, var_export($user, 1));
 
     // Login using password reset page.
     $url = user_pass_reset_url($user);
+$this->assertTrue(1, var_export($url, 1));
     sleep(1); // TODO Find better way.
     $this->drupalGet($url);
     $this->assertText(t('This login can be used only once.'), t('Login can be used only once.'));
@@ -74,7 +78,7 @@ class UserRegistrationTestCase extends D
     // Make sure password changes are present in database.
     require_once DRUPAL_ROOT . '/' . variable_get('password_inc', 'includes/password.inc');
 
-    $user = user_load(array('uid' => $user->uid));
+    $user = user_load($user->uid, TRUE);
     $this->assertTrue(user_check_password($new_pass, $user), t('Correct password in database.'));
 
     // Logout of user account.
@@ -169,12 +173,13 @@ class UserDeleteTestCase extends DrupalW
     variable_set('user_register', 1);
 
     $edit = array();
-    $edit['name'] = $this->randomName();
-    $edit['mail'] = $edit['name'] . '@example.com';
+    $edit['name'] = $name = $this->randomName();
+    $edit['mail'] = $mail = $edit['name'] . '@example.com';
     $this->drupalPost('user/register', $edit, t('Create new account'));
     $this->assertText(t('Your password and further instructions have been sent to your e-mail address.'), t('User registered successfully.'));
 
-    $user = user_load($edit);
+    $users = user_load_multiple(array(), array('name' => $name, 'mail' => $mail));
+    $user = reset($users);
 
     // Create admin user to delete registered user.
     $admin_user = $this->drupalCreateUser(array('administer users'));
@@ -189,7 +194,7 @@ class UserDeleteTestCase extends DrupalW
     // Confirm deletion.
     $this->drupalPost(NULL, NULL, t('Delete'));
     $this->assertRaw(t('%name has been deleted.', array('%name' => $user->name)), t('User deleted'));
-    $this->assertFalse(user_load($edit), t('User is not found in the database'));
+    $this->assertFalse(user_load($user->uid), t('User is not found in the database'));
   }
 }
 
@@ -498,13 +503,13 @@ class UserAdminTestCase extends DrupalWe
     $this->assertText($user_c->name, t('Found user C on filtered by perm admin users page'));
 
     // Test blocking of a user.
-    $account = user_load(array('name' => $user_b->name));
+    $account = user_load($user_b->uid);
     $this->assertEqual($account->status, 1, 'User B not blocked');
     $edit = array();
     $edit['operation'] = 'block';
     $edit['accounts['. $account->uid .']'] = TRUE;
     $this->drupalPost('admin/user/user', $edit, t('Update'));
-    $account = user_load(array('name' => $user_b->name));
+    $account = user_load($user_b->uid, TRUE);
     $this->assertEqual($account->status, 0, 'User B blocked');
   }
 }