fix: improve key cache performance

Author: marcocesarato

src/Cache.php

@@ -7,7 +7,7 @@
 class Cache extends SingletonAbstract
 {
     protected static $cache;
-    protected static $prefix = 'cache_';
+    protected static $ext = 'cache';
     protected static $DS = DIRECTORY_SEPARATOR;
 
     protected $tempdir;
@@ -173,7 +173,13 @@ public function deleteRegex($pattern = '*')
      */
     protected function key($key)
     {
-        return self::$prefix . md5($key);
+        $filename = $key . '.' . self::$ext;
+        $special_chars = array('?', '[', ']', '/', '\\', '=', '<', '>', ':', ';', ',', "'", '"', '&', '$', '#', '*', '(', ')', '|', '~', '`', '!', '{', '}');
+        $filename = str_replace($special_chars, '', $filename);
+        $filename = preg_replace('/[\s-]+/', '-', $filename);
+        $filename = trim($filename, '.-_');
+
+        return $filename;
     }
 
     /**

src/Modules/Wordpress.php

@@ -163,7 +163,7 @@ public static function getPluginHeaders($file)
     public static function getChecksums($version, $locale = 'en_US')
     {
         $cache = Cache::getInstance();
-        $key = 'wordpress_' . $version . '-' . $locale;
+        $key = 'wordpress_' . $locale . '-' . $version;
         $checksums = $cache->get($key);
 
         if (is_null($checksums)) {
@@ -203,7 +203,7 @@ public static function getPluginsChecksums($plugins = array())
         $cache = Cache::getInstance();
         $pluginsChecksums = array();
         foreach ($plugins as $plugin) {
-            $key = 'wordpress_' . $plugin['domain'] . '-' . $plugin['version'];
+            $key = 'wordpress-plugin_' . $plugin['domain'] . '-' . $plugin['version'];
             $checksums = $cache->get($key);
 
             if (!is_null($checksums)) {