What steps can be taken to troubleshoot a "Call to undefined function mysql_connect()" error in PHP?

The "Call to undefined function mysql_connect()" error in PHP occurs when the MySQL extension is not enabled in the PHP configuration. To solve this issue, you can enable the MySQL extension by installing the MySQL driver and updating the PHP configuration to include the necessary extension. 

// Enable the MySQL extension in PHP configuration
// 1. Install the MySQL driver
// For example, on Ubuntu you can run: sudo apt-get install php-mysql
// 2. Update the PHP configuration file (php.ini) to include the MySQL extension
// extension=mysql.so (uncomment this line)

// After making these changes, restart your web server for the changes to take effect

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mysql_connect PHP troubleshooting error undefined function

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