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Editorial Team
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Asked: 2026-06-07T05:43:48+00:00

If I have a config.php file with variables in it like so… config.php :

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If I have a config.php file with variables in it like so…

config.php:

$cnf['dbhost'] = "0.0.0.0";
$cnf['dbuser'] = "mysqluser";
$cnf['dbpass'] = "mysqlpass";

How can I then access these variables from a class which is in another file, such as…

inc/db.class.php:

class db() {

  function connect() {
    mysql_connect($cnf['dbhost'], $cnf['dbuser'], $cnf['dbpass']);
  }

}
$db = new db();

So, I can use the class in another file such as…

index.php:

<html>
  <?php
    include('config.php');
    include('inc/db.class.php');
    $db->connect();
  ?>
</html>
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1 Answer

  1. Editorial Team

    Include config file with include, require or require_once at the beginning of your db script. You will also need to specify $cnf as global in the function you want to use, otherwise you cannot access global variables:

    include "../config.php";

class db() {

  function connect() {
      global $cnf;
      mysql_connect($cnf['dbhost'], $cnf['dbuser'], $cnf['dbpass']);
  }

}
$db = new db();

    EDIT:
    On big project I prefer to use a boot.php where I include all the php files, so I wont need to include in every file everything I need. Having this, I just need to include the boot into the index.php and have to disposition all the definitions. It’s slightly slower but really comfortable.

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