upgrade

plugin/hello_world/install.php

@@ -0,0 +1,14 @@
+<?php
+/* PHP code to install the plugin
+ * For example:
+ *
+    // To query something to the database
+
+    $table = Database::get_main_table(TABLE_MAIN_USER); // TABLE_MAIN_USER is a constant check the main/inc/database.constants.inc.php
+    $sql = "SELECT firstname, lastname FROM $table_users ";
+    $users = Database::query($sql);
+
+    You can also use the Chamilo classes
+    $users = UserManager::get_user_list();
+
+ */