I want a plugin that when a page is displayed, if there is a URL variable called "vacancy" it will display that in the <title> of the page.
For example, I have a Wordpress page that has some PHP custom code to display some job details out of a database based on what's passed via the URL variable.
However, the page title just says "Vacancy details"
What I need is for the page to actually display whatever is in the URL variable "vacancy"