php - Codeigniter: fatal error call to undefined function mysqli_init()

Php - Codeigniter: fatal error call to undefined function mysqli_init()

The "Call to undefined function mysqli_init()" error in CodeIgniter indicates that the mysqli extension is not enabled in your PHP configuration. The mysqli_init() function is a part of the MySQL Improved Extension (mysqli), and its absence suggests that the mysqli extension is not available.

Here are the steps to resolve this issue:

1. Enable mysqli Extension:

Ensure that the mysqli extension is enabled in your PHP configuration.

For PHP >= 7.0:

If you are using PHP version 7.0 or later, the mysqli extension is usually bundled with PHP. You need to uncomment or add the following line in your php.ini file:

extension=mysqli

After making changes, restart your web server to apply the configuration.

For PHP < 7.0:

If you are using PHP version earlier than 7.0, you may need to install the php-mysqli package. The exact command can vary depending on your operating system.

  • For Debian/Ubuntu:

    sudo apt-get install php-mysqli

  • For Red Hat/Fedora:

    sudo yum install php-mysqli

After installing or enabling the mysqli extension, restart your web server.

2. Verify Extension Loading:

Create a PHP file (e.g., phpinfo.php) and add the following code:

<?php phpinfo();

Access this file from your browser (e.g., http://yourdomain.com/phpinfo.php) and check if the mysqli extension is listed as enabled. Look for a section like "mysqli" in the output.

3. Check PHP Version:

Ensure that you are using a PHP version that supports the mysqli extension. The mysqli_init() function is available in PHP 5.3.0 and later.

4. Restart Web Server:

After making any changes to the PHP configuration, remember to restart your web server to apply the changes.

Examples

  1. Checking PHP MySQLi Extension:

    // In your CodeIgniter database configuration $active_group = 'default'; $query_builder = TRUE; $db['default'] = array( 'dsn' => '', 'hostname' => 'localhost', 'username' => 'your_username', 'password' => 'your_password', 'database' => 'your_database', 'dbdriver' => 'mysqli', // Ensure 'mysqli' is specified 'dbprefix' => '', 'pconnect' => FALSE, 'db_debug' => (ENVIRONMENT !== 'production'), 'cache_on' => FALSE, 'cachedir' => '', 'char_set' => 'utf8', 'dbcollat' => 'utf8_general_ci', 'swap_pre' => '', 'encrypt' => FALSE, 'compress' => FALSE, 'stricton' => FALSE, 'failover' => array(), 'save_queries' => TRUE );

    Description: Ensure that the 'mysqli' driver is specified in your CodeIgniter database configuration.

  2. Checking PHP Configuration for MySQLi:

    // In your CodeIgniter controller or model if (!function_exists('mysqli_init') && !extension_loaded('mysqli')) { echo 'mysqli is not installed.'; die(); }

    Description: Check if the MySQLi extension is loaded and the mysqli_init function exists in your CodeIgniter code.

  3. Ensuring MySQLi Extension is Enabled:

    ; In your php.ini file extension=mysqli

    Description: Ensure that the MySQLi extension is enabled in your PHP configuration file (php.ini).

  4. Checking MySQLi Extension Installation:

    php -m | grep mysqli

    Description: Use the command line to check if the MySQLi extension is installed and enabled in your PHP environment.

  5. Verifying MySQLi Extension in PHP Info:

    // In your CodeIgniter controller or model phpinfo();

    Description: Check the PHP Info page to verify if the MySQLi extension is listed and enabled.

  6. Reinstalling MySQLi Extension via Composer:

    composer require php-mysqli

    Description: Use Composer to reinstall the MySQLi extension for your CodeIgniter project.

  7. Checking MySQLi Extension Version:

    // In your CodeIgniter controller or model echo 'MySQLi Extension Version: ' . mysqli_get_client_version();

    Description: Check the version of the MySQLi extension in your CodeIgniter environment.

  8. Updating PHP to a Version with MySQLi Support:

    sudo apt-get update sudo apt-get install php-mysqli

    Description: Update PHP and install the MySQLi extension if your PHP version lacks MySQLi support.

  9. Verifying MySQLi Installation on Server:

    php -i | grep mysqli

    Description: Use the command line to verify the MySQLi installation details on your server.

  10. Checking MySQLi Extension in CodeIgniter Error Logs:

    // In your CodeIgniter controller or model error_log('MySQLi Extension: ' . (extension_loaded('mysqli') ? 'Loaded' : 'Not Loaded'));

    Description: Check the error logs in your CodeIgniter application to determine if the MySQLi extension is loaded.

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