Use different «Single.php» for custom categories

you can use:

 if ( in_category('cat1') || in_category('cat2')) {
        include 'single-cattwo.php'; //for the 2 categories
    } else {
        // Default
        include 'single-allcat.php';//all categories
    }

inside single.php

Hata!: SQLSTATE[HY000] [1045] Access denied for user 'divattrend_liink'@'localhost' (using password: YES)