[Opserty]

Variables are coded like this in php:

PHP Code:

$variable = 'Your String'; 


In vBulletin it is possible to place variables in templates so you could write $strTitle in your template and then change it accordingly for each php file.

Is there a major difference between each of the jobX.php files?

You can create subpages within just a single job.php page, see this:
See the Creating Subpages section: https://vborg.vbsupport.ru/showthread.php?t=98009

Then you can access each section using the url http://anydomain.com/job.php?do=1 or something like that.