i had noticed that some code doesn't play nice when i use libapache2-mod-filter while it working as expected in libapache2-mod-php5

the error was generated by doctrine + it's very simple like :

  $db = new self();
        $db["name"] = $name;
        $db["desc"] = $desc;
  $db->save();  /// it throw the error here 

error message like :

Syntax error or access violation: 1064 You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'desc) VALUES ('aaaaaaaaaaa', 'aaaaaaaaaaaa')' at line 1

so what is the real difference between the both modules for php5 ???