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Simple implementation of wordpress wp-cron.php.
It's a shell that use php and not curl or wget.
it's implement a semaphre resource to check if have an other process of the same wp-cron.
HopiCron is a php-cron deamon for cheap webhosting packages that don't support cron jobs. It works by http-querying itself (fsockopen). HopiCron works with Apache and probably other webservers. No database is needed since hopiCron uses crontab files