Why Am I Getting the 'Fatal error: Class 'MySQLi' not found' Error in PHP?

Addressing the "Fatal Error: Class 'MySQLi' Not Found" Conundrum

In the realm of web development, encountering errors is an inevitable aspect of the journey. Among these, the "Fatal error: Class 'MySQLi' not found" is a common stumbling block for programmers. This issue often arises when attempting to establish a connection to a MySQL database.

Understanding the Error

This error typically manifests when a PHP script tries to instantiate the MySQLi class, a crucial component for interacting with MySQL databases. However, if this class isn't recognized, the script cannot execute the intended database operations, resulting in the aforementioned error.

Investigating Potential Causes

Before embarking on troubleshooting measures, it's essential to verify that the MySQLi extension is indeed installed and enabled for use. To ascertain this, consult your PHPinfo. If "mysqli" doesn't appear in the list of loaded extensions, that's a clear indicator that it's not available.

Furthermore, ensure that your PHP version meets the requirements for MySQLi. In this case, PHP 5.2.5 is the version being used, which potentially poses a compatibility issue. Check if your hosting environment provides a version of PHP that supports MySQLi.

Installing and Enabling MySQLi

If you've confirmed that MySQLi is missing, proceed with the installation process. Detailed instructions vary depending on your system and operating environment. However, generally, you can utilize the following commands to accomplish this:

sudo apt-get install php-mysqli
sudo apt-get install php5-mysqli

Once installed, ensure that the MySQLi extension is appropriately enabled in your web server configuration, usually Apache or Nginx. Check the "extension=" directive in your configuration file to verify that "mysqli.so" is included.

Resolving the Error

After successfully installing and enabling MySQLi, revisit your PHP script and modify the code on line 8 to ensure proper instantiation of the MySQLi class. Replace $mysqli with $link, as exemplified below:

$link = new MySQLi($db_server, $db_user, $db_pass, $db_name);

Executing this modified script should now establish the MySQL connection without encountering the "Fatal error: Class 'MySQLi' not found" issue.

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