Thank you for the hints given. I'll look into the various options given. The main reason for the need for a persistent flag in memory is that several installations where the PHP code would be deployed do not have access to crontab, so I am simulating crontab's functionality by letting a PHP script run forever. Page visits would start that script, but once the first visitor has started the script, next visitors would only start it if the script had died. Here is where the persistent flag is needed. Normally the script will never die unless at server reboot, or perhaps if some timeout limit has been exceeded. If I would touch a file in the filesystem as a flag, this would persist even after server reboot, so that means that my simulated crontab would never restart, since it looks like it runs. Teus.
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