Why Am I Getting the 'Fatal error: Call to undefined function mysqli_connect()' Error in PHP?

Troubleshooting "Fatal error: Call to undefined function mysqli_connect()": A Step-by-Step Guide

The "Fatal error: Call to undefined function mysqli_connect()" error commonly occurs when a PHP script attempts to use the mysqli_connect() function without it being properly loaded or available.

Possible Causes:

• PHP Extension Not Loaded: Ensure that the PHP MySQLi extension (php-mysqli) is enabled on your server. You can check this by running the following command in the terminal:

php -m | grep mysqli

If you see "mysqli" listed, the extension is enabled. If not, proceed to the next step.

Solution:

To install the PHP MySQLi extension on Ubuntu/Debian systems, run the following command:

sudo apt install php-mysqli

Version Compatibility:

Confirm that the installed PHP MySQLi extension is compatible with your PHP version. The error message may also include information about the missing version.

Code Issue:

Review your PHP code carefully. Ensure that the connection parameters passed to mysqli_connect() are correct (host, user, password, database).

Confirm Host Access:

Verify that your PHP script has permission to connect to the MySQL server. This can be done by checking your MySQL configuration file (usually /etc/mysql/my.cnf) or by contacting your server administrator.

Final Note:

Once the necessary changes have been made, restart your web server (e.g., Apache, Nginx) to apply the changes. The mysqli_connect() function should now be available, resolving the fatal error.

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