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BB-Code-like mechanism by which strings enclosed in square brackets can serve as shorthand for longer and more complicated strings. These strings are processed by callback handlers, usually on page load, which replace the bracket enclosed string with the output from the callback handler.
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Using shortcodes to parse POST request (containing the data from a front-end form)
I define a [classifieds-form] shortcode displaying the form and I create a page (ie., a "page" post in the admin section) calling it. … The content of the form is POST'ed to another page which calls the [handle-classified] shortcode, which checks if the user is logged in, parses the $_POST data, and inserts the custom post (with a 'pending …