php-cron. 实现PHP Cron，也就是PHP定时任务，通过本地文件记录schedules，然后通过fsockopen实现非阻塞式的后台访问对应的url来实现定时任务，通过sleep实现定时，如果错过任务，则通过用户访问来执行该任务（还未完善）

Problem

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Audience

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Market

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Pricing

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