strip_tags_long: use htmlpurifier to properly reformat html content

lib/htmlpurifier/library/HTMLPurifier/ConfigSchema/Interchange/Id.php

@@ -0,0 +1,31 @@
+<?php
+
+/**
+ * Represents a directive ID in the interchange format.
+ */
+class HTMLPurifier_ConfigSchema_Interchange_Id
+{
+
+    public $namespace, $directive;
+
+    public function __construct($namespace, $directive) {
+        $this->namespace = $namespace;
+        $this->directive = $directive;
+    }
+
+    /**
+     * @warning This is NOT magic, to ensure that people don't abuse SPL and
+     *          cause problems for PHP 5.0 support.
+     */
+    public function toString() {
+        return $this->namespace . '.' . $this->directive;
+    }
+
+    public static function make($id) {
+        list($namespace, $directive) = explode('.', $id);
+        return new HTMLPurifier_ConfigSchema_Interchange_Id($namespace, $directive);
+    }
+
+}
+
+// vim: et sw=4 sts=4