diff --git a/apc.install b/apc.install
index bab073d..106e500 100644
--- a/apc.install
+++ b/apc.install
@@ -33,3 +33,63 @@ function apc_requirements($phase) {
 
   return $requirements;
 }
+
+/**
+ * Implements hook_schema().
+ */
+function apc_schema() {
+  $schema = array();
+
+  $schema['apc_last_purge'] = array(
+    'description' => 'The time that cache bins were last purged.',
+    'fields' => array(
+      'bin' => array(
+        'type' => 'varchar',
+        'length' => 128,
+        'not null' => TRUE,
+        'default' => '',
+        'description' => 'The cache bin.',
+      ),
+      'timestamp' => array(
+        'type' => 'int',
+        'not null' => TRUE,
+        'description' => 'The timestamp of the last cache purge.',
+        'default' => 0,
+      ),
+    ),
+    'indexes' => array(
+      'bin_timestamp' => array('bin', 'timestamp'),
+    ),
+  );
+
+  return $schema;
+}
+
+/**
+ * Install the {apc_last_purge} table.
+ */
+function apc_update_7100() {
+  $schema = array(
+    'description' => 'The time that cache bins were last purged.',
+    'fields' => array(
+      'bin' => array(
+        'type' => 'varchar',
+        'length' => 128,
+        'not null' => TRUE,
+        'default' => '',
+        'description' => 'The cache bin.',
+      ),
+      'timestamp' => array(
+        'type' => 'int',
+        'not null' => TRUE,
+        'description' => 'The timestamp of the last cache purge.',
+        'default' => 0,
+      ),
+    ),
+    'indexes' => array(
+      'bin_timestamp' => array('bin', 'timestamp'),
+    ),
+  );
+
+  db_create_table('apc_last_purge', $schema);
+}
diff --git a/drupal_apc_cache.inc b/drupal_apc_cache.inc
index 2099c55..765c128 100644
--- a/drupal_apc_cache.inc
+++ b/drupal_apc_cache.inc
@@ -37,6 +37,27 @@ class DrupalAPCCache implements DrupalCacheInterface {
   protected $prefix;
 
   /**
+   * The times that bins were last purged.
+   *
+   * @var array
+   */
+  protected static $purgeTimes;
+
+  /**
+   * The time this bin was last purged.
+   *
+   * @var int
+   */
+  protected $lastPurged = 0;
+
+  /**
+   * Whether to track cache purges.
+   *
+   * @var bool
+   */
+  protected $trackPurges;
+
+  /**
    * Get prefix for bin using the configuration.
    *
    * @param string $bin
@@ -98,6 +119,17 @@ class DrupalAPCCache implements DrupalCacheInterface {
     }
 
     $this->prefix = $prefix;
+
+    if ($this->trackPurges = variable_get('apc_track_cache_purges', FALSE)) {
+      // Find out when the cache bin was last purged.
+      if (!isset(self::$purgeTimes)) {
+        self::$purgeTimes = db_query("SELECT bin, timestamp FROM {apc_last_purge}")->fetchAllKeyed();
+      }
+
+      if (isset(self::$purgeTimes[$this->bin])) {
+        $this->lastPurged = self::$purgeTimes[$this->bin];
+      }
+    }
   }
 
   /**
@@ -147,6 +179,13 @@ class DrupalAPCCache implements DrupalCacheInterface {
       return FALSE;
     }
 
+    // The cache was cleared externally. Either on another server, or Drush. Our
+    // cache is out of date.
+    if ($cache->created < $this->lastPurged) {
+      $this->flush();
+      return FALSE;
+    }
+
     // If enforcing a minimum cache lifetime, validate that the data is
     // currently valid for this user before we return it by making sure the cache
     // entry was created before the timestamp in the current session's cache
@@ -183,7 +222,7 @@ class DrupalAPCCache implements DrupalCacheInterface {
 
     $cids = array_diff($cids, array_keys($cache));
 
-    return $cache;
+    return array_filter($cache);
   }
 
   function set($cid, $data, $expire = CACHE_PERMANENT, array $headers = NULL) {
@@ -255,14 +294,17 @@ class DrupalAPCCache implements DrupalCacheInterface {
   }
 
   function clear($cid = NULL, $wildcard = FALSE) {
-    if (drupal_is_cli() && function_exists('drush_log')) {
-      drush_log($this->bin . '(' . $cid . ') was not cleared. APC cli uses a different memory storage than the webserver. For more info see: http://drupal.org/node/1278232', 'warning');
-      return;
-    }
-
-    // Add a get to our statistics.
+    // Add a clear to our statistics.
     $GLOBALS['apc_statistics'][] = array('clear', $this->bin, $cid, (int)$wildcard);
 
+    // Mark the time this cache was purged.
+    if ($this->trackPurges && $cid === '*' && $wildcard === TRUE) {
+      db_merge('apc_last_purge')
+        ->key(array('bin' => $this->bin))
+        ->fields(array('timestamp' => time()))
+        ->execute();
+    }
+
     if (!empty($cid) && class_exists('APCIterator')) {
       if ($wildcard) {
         if ($cid == '*') {