CodeIgniter MySQLi Driver: How to Fix \'Unable to Connect to Database\' Errors?

CodeIgniter: Resolving "Unable to Connect to Database" Error with MySQL Driver

Problem Statement:

When attempting to switch from the MySQL driver to the MySQLi driver in CodeIgniter, users encounter the following error message:

Unable to connect to your database server using the provided settings.

Configuration Details:

The provided database configuration settings are as follows:

$hostname = 'localhost';
$username = 'myusernamegoeshere';
$password = 'mypasswordgoeshere';
$database = 'mydatabasenamegoeshere';
$db['default']['dbdriver'] = 'mysqli';
$db['default']['port'] = "3306"; 

Solution:

The issue is likely related to PHP configuration. To debug the database connection, follow these steps:

Step 1: Enable Database Connection Error Diagnostics

Add the following code to the end of your database.php configuration file:

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

Step 2: Debug Database Connection Attempt

Navigate to your CodeIgniter installation directory and run the following command to debug the database connection attempt:

php -f ./system/index.php db debug

Step 3: Analyze Output

The command will output detailed information about the database connection attempt, including any errors encountered. Review the output to identify the root cause of the connectivity issue.

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