What are the limitations of executing commands at a specific time in PHP scripts, especially when no users are logged in?

When no users are logged in, PHP scripts cannot be executed as there is no active session to trigger the script. One solution to this limitation is to use a cron job to schedule the execution of the PHP script at a specific time. 

// Example PHP script to be executed by a cron job
// This script will run at a specific time set in the cron job

// Your PHP script logic here
echo "This script was executed at " . date('Y-m-d H:i:s') . "\n";

Keywords

Cron job server-side scheduling shell_exec background processes nohup.

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