Why Can't CodeIgniter Connect to My Database Server?

Troubleshooting "Unable to connect to your database server using the provided settings" Error in CodeIgniter

Encountering the "Unable to connect to your database server" error in CodeIgniter can be frustrating. Let's delve into the potential causes and a recommended solution:

Possible Cause: Misconfiguration in PHP Configuration

Your PHP configuration may be the culprit behind this error. Consider these steps to troubleshoot:

Debug Database Connection

Add the following code snippet at the end of your ./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__);

Running this script will provide detailed information about your database connection. Check for any errors or inconsistencies in the output.

Additional Considerations:

• Ensure the hostname, username, password, and database name are correct.
• Verify that the MySQL server is running and accessible.
• Check the firewall settings to ensure that the database port is open.
• Update the php.ini file to enable MySQLi extension.

Remember to remove the debug script before going live with your application.

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