mysql - PHP PDO statement using constants -


so have different file called config.php declares constants using. included config.php in php script coding:

my php script:

    <?php         session_start();         //connection config         include 'config.php';          $con = new pdo('mysql:host="'. db_host .'";dbname="'. db_name .'"', db_user,db_password);     ?>

in config.php:

<?php define('db_host','localhost');  define('db_name','theclass'); //name of database define('db_user','root'); //mysql user define('db_password',''); //mysql password   ?>

however, wamp throwing error on $con = new pdo line giving me fatal error. parameter's used in pdo statement correct in terms of format, because i'm not sure if need quotations around db variables.


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