Using shortcodes to parse POST request (containing the data from a front-end form)

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I would like to allow my subscribers to post classifieds, which are nothing but a custom post type with a few metas for the price, etc. (The existing classifieds plugins I have tried are way too complex for my needs.) I would like to know if the following makes sense.

Does this sound reasonable to you? Or would you recommend a more “standard” way of doing this?

Thanks a lot!

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  1. Alway send submissions to the page the form is displayed. In your shortcode callback you can then display proper error or success messages.

    Sample:

    add_shortcode( 'classifiedsform', 'classifiedsform_callback' );

function classifiedsform_callback()
{
    if ( 'POST' !== $_SERVER['REQUEST_METHOD'] 
        or ! isset ( $_POST['classifieds'] )
    )
    {
        return classifieds_input_form();
    }

    // process input show errors or success message

}

function classifieds_input_form()
{
    // return a string with the form HTML
}

    Make sure you don’t use a reserved variable or WordPress will drop the content silently.