WordPress Plug-ins: How-to add custom URL Handles

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I’m trying to write a WordPress Plug-in but can’t seem to figure out how you would modify how a URL gets handled, so for example: any requests made for:

<url>/?myplugin=<pageID>

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will get handled by a function in my plug-in. I’m sure this is a very simple to do, but I’m pretty new to working with WordPress and couldn’t find it in the documentation.

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  1. In order to handle just a specific URL use the code below:

    add_action('parse_request', 'my_custom_url_handler');

function my_custom_url_handler() {
   if(isset($_GET['myplugin']) && $_SERVER["REQUEST_URI"] == '/custom_url') {
      echo "<h1>TEST</h1>";
      exit();
   }
}

  2. add_action('parse_request', 'my_custom_url_handler');
function my_custom_url_handler() {
  if( isset($_GET['myplugin']) ) {
    // do something
    exit();
  }
}

    That should set you on the right direction. parse_request happens before WordPress runs any of the complicated WordPress queries used to get the posts for the current URL.