flush -- WIP admin panel

include/notification.php

@@ -0,0 +1,21 @@
+<?php
+function cavern_notify_user($username, $message="你有新的通知!", $url="", $type="") {
+    global $SQL;
+    $time = date('Y-m-d H:i:s');
+    $SQL->query("INSERT INTO `notification` (`username`, `message`, `url`, `type`, `time`) VALUES ('%s', '%s', '%s', '%s', '%s')", array($username, $message, $url, $type, $time));
+}
+
+function parse_user_tag($markdown) {
+    $regex = array(
+        "code_block" => "/(`{1,3}[^`]*`{1,3})/",
+        "email" => "/[^@\s]*@[^@\s]*\.[^@\s]*/",
+        "username" => "/@(\w+)/"
+    );
+
+    $tmp = preg_replace($regex["code_block"], " ", $markdown);
+    $tmp = preg_replace($regex["email"], " ", $tmp);
+
+    preg_match_all($regex["username"], $tmp, $username_list);
+
+    return array_unique($username_list[1]);
+}