CodeIgniter Database Connection Error: How to Fix \'Unable to connect to your database server...\'?

Database Connection Error in CodeIgniter: Resolving "Unable to connect to your database server..." Message

Problem:

Developers using CodeIgniter encounter an error when switching to the MySQL driver. Despite correct database settings, they receive the error message: "Unable to connect to your database server using the provided settings."

Solution:

The issue may lie in the PHP configuration. To troubleshoot, follow these steps:

1. Debug Database Connection:

   Append the following script to the end of ./config/database.php file:

   ...
   ...
   ...
   echo '<pre class="brush:php;toolbar:false">';
   print_r($db['default']);
   echo '

   '; echo 'Connecting to database: ' .$db['default']['database']; $dbh=mysql_connect ( $db['default']['hostname'], $db['default']['username'], $db['default']['password']) or die('Cannot connect to the database because: ' . mysql_error()); mysql_select_db ($db['default']['database']); echo '
   Connected OK:' ; die( 'file: ' .__FILE__ . ' Line: ' .__LINE__);

2. Examine the Output:

   Run the script and inspect the output. It will display the database settings you configured.

   If you see "Connected OK," then the database connection is successful. Otherwise, it will display the actual reason for the connection failure (e.g., incorrect password, hostname, or port).

3. Resolve Connection Error:

   Based on the output, determine what is causing the connection error and resolve it. For instance, if the hostname is incorrect, update it to the correct value in your database settings.

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