Does anyone know of one? I want to start using cron jobs, but I can't find a tutorial for php anywhere.
Cron will run any executable file, there's no "cron job" file format. http://unixgeeks.org/security/newbie/unix/cron-1.html is a pretty good tutorial.
you just need put your command on your server, it will run / execute any executable file, try http://clickmojo.com/code/cron-tutorial.html
Its not always that straight forward, depending on the server build the command to call may be different. The server my sites are on at present refused to work with anything other than a wget
I know what it does, I should have been more specific. I need a tutorial for setting up a command to execute a php script
There is none - just the name of the script file. Assuming your script file is named cronjob.php, the command is cronjob.php Nothing more than that.
If you're using Cpanel, then it is pretty much plug and play. You just need to specify time intervals and the file to execute. @chanif.alfath - nice beginner tut on creating a cron file