Use a real PHP array for the cache

app/code/community/Varien/Autoload.php

@@ -178,11 +178,11 @@ public static function loadCacheContent()
                 self::setCache($value);
             }
         } elseif (file_exists(self::getCacheFilePath())) {
-            $cacheFilePath = unserialize(file_get_contents(self::getCacheFilePath()));
-            // If the file is corrupted, it resets cache
-            if ($cacheFilePath === false) {
+            $cacheFilePath = require self::getCacheFilePath();
+            if (!is_array($cacheFilePath)) {
                 $cacheFilePath = array();
             }
+
             self::setCache($cacheFilePath);
         }
 
@@ -266,27 +266,61 @@ public static function getCache()
         return self::$_cache;
     }
 
+    /**
+     * Save the cache to disk
+     */
+    public function save()
+    {
+        if (self::isApcUsed()) {
+            if (PHP_SAPI != 'cli') {
+                apc_store(self::getCacheKey(), self::$_cache, 0);
+            }
+        } elseif (is_dir_writeable(dirname(self::getCacheFilePath()))) {
+            $this->_createCacheFile();
+        }
+    }
+
+    /**
+     * Create the cache file
+     */
+    protected function _createCacheFile()
+    {
+        $content = "<?php\n// DO NOT EDIT THIS FILE!\n\nreturn array(\n";
+
+        Mage::log(print_r(self::$_cache, true));
+        foreach (self::$_cache as $key => $filename) {
+            $content .= "\t'$key' => '$filename',\n";
+        }
+
+        $content .= ');';
+
+        $this->_writeCacheFile($content);
+    }
+
+    /**
+     * Write the cache to disk
+     *
+     * @param  string $content
+     */
+    protected function _writeCacheFile($content)
+    {
+        $tmpFile = tempnam(sys_get_temp_dir(), 'aoe_classpathcache');
+        if (file_put_contents($tmpFile, $content)) {
+            if (@rename($tmpFile, self::getCacheFilePath())) {
+                @chmod(self::getCacheFilePath(), 0664);
+            } else {
+                @unlink($tmpFile);
+            }
+        }
+    }
+
     /**
      * Class destructor
      */
     public function __destruct()
     {
         if (self::$_numberOfFilesAddedToCache > 0) {
-            if (self::isApcUsed()) {
-                if (PHP_SAPI != 'cli') {
-                    apc_store(self::getCacheKey(), self::$_cache, 0);
-                }
-            } elseif (is_dir_writeable(dirname(self::getCacheFilePath()))) {
-                $fileContent = serialize(self::$_cache);
-                $tmpFile = tempnam(sys_get_temp_dir(), 'aoe_classpathcache');
-                if (file_put_contents($tmpFile, $fileContent)) {
-                    if (@rename($tmpFile, self::getCacheFilePath())) {
-                        @chmod(self::getCacheFilePath(), 0664);
-                    } else {
-                        @unlink($tmpFile);
-                    }
-                }
-            }
+            $this->save();
         }
     }
 }