What could be causing the "Uncaught Error: Call to undefined function mysqli_connect()" error in PHP?

The "Uncaught Error: Call to undefined function mysqli_connect()" error in PHP typically occurs when the MySQLi extension is not enabled in the PHP configuration or the MySQLi module is not installed. To solve this issue, you need to enable the MySQLi extension in your PHP configuration file (php.ini) or install the MySQLi module on your server. 

// Enable the MySQLi extension in php.ini file
extension=mysqli

// Or install the MySQLi module on your server
// For example, on Ubuntu, you can install it using the following command:
// sudo apt-get install php-mysql

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Uncaught Error mysqli_connect PHP undefined function error

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