How can external services be used to trigger PHP scripts for regular maintenance tasks?

External services like cron jobs or webhooks can be used to trigger PHP scripts for regular maintenance tasks. By setting up a cron job on the server to run a PHP script at specified intervals or configuring a webhook to send a request to a PHP script when a certain event occurs, you can automate tasks such as database backups, data syncing, or cache clearing.

// Example of a PHP script triggered by a cron job for regular maintenance tasks

// Check if script is being accessed from the command line
if (php_sapi_name() === 'cli') {
    // Add your maintenance tasks here
    echo "Maintenance tasks completed.";
} else {
    // Script should only be accessed via command line
    http_response_code(403);
    echo "Forbidden";
}