pseudo-cron v1.3 for seo-pages
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Usually regular tasks like backup up the site’s database are run using cron jobs. With cron jobs, you can exactly plan when a certain command is to be executed. But most homepage owners can’t create cron jobs on their web server – providers demand some extra money for that.
The only thing that’s certain to happen quite regularly on a web page are page requests. This is where pseudo-cron comes into play: With every page request it checks if any cron jobs should have been run since the previous request. If there are, they are run and logged.
These pages use pseudo-cron:
Pseudo-cron uses a syntax very much like the Unix cron’s one. For an overview of the syntax used, see a page of the UNIXGEEKS. The syntax pseudo-cron uses is different from the one described on that page in the following points:
- you may not use abbreviations (Mon, Tue, …) for day of week new in v1.1!
- there is no user column
- the executed command has to be an include()able file (which may contain further PHP code)
All job definitions are made in a text file on the server with a user-definable name (usually crontab.txt). Here is an example of a valid crontab file:
#comments start with '#' #mi h d m dow job comment 0 5 * * Sun cronjobs/dump.inc.php # make db dump every sunday at 5 am 40 5 2 * * cronjobs/sendlog.inc.php # send last month's web server logs */15 8-19 * * Mon-Fri cronjobs/refr_ext.inc.php # refresh external news sources
The last line will call
cronjobs/refr_ext.inc.php every 15 minutes between 8am and 7pm on Monday to Friday.
|Features:||runs any PHP script
periodical or time-controlled script execution
logs all executed jobs
can be run from an IMG tag in an HTML page
follows Unix cron syntax for crontabs
sends an email with the results
|Usage:||Modify the variables in the config section below to match your server.
Write a PHP script that does the job you want to be run regularly. Be sure that any paths in it are relative to the script that include()s pseudo-cron.
Set up your crontab file with your script
Include pseudo-cron.inc.php in a high traffic page
Wait for the next scheduled run 🙂
|Note:||You can log messages from your job script to pseudo-cron’s log file by calling
added: the number of jobs run during one call of pseudocron can now be limited.
added: additional script to call pseudocron from an HTML img tag
improved storage of job run times
fixed a bug with jobs marked as run although they did not complete
added: send an email for each completed job
improved: easier cron job configuration (relative to pseudo-cron, not to calling script. Please read the release notes in the source.
fixed: jobs may be run too often under certain conditions
added: global debug switch
added: more documentation
changed: log file should now be easier to use
changed: log file name
changed: renamed pseudo-cron.php to pseudo-cron.inc.php
fixed: comments at the end of a line don’t work
fixed: empty lines in crontab file create nonsense jobs
changed: log file grows big very quickly
changed: included config file in main file to avoid directory confusion
added: day of week abbreviations may now be used (three letters, english)