added static keyword to function

_class/class_training_type.php

@@ -32,7 +32,7 @@ class training_type {
 		return $this->trt_deleted;
 	}
 
-	public function create_training_type($_trt_value_array) {
+	public static function create_training_type($_trt_value_array) {
 		global $sql;
 		return $sql->insert_into('training_type', $_trt_value_array);
 	}