[Wordpress] Passing parameters (extra variables) in URL and read them from a page

Sometimes you need a simple way of passing a custom URL variable to WordPress. I will expose in this article my custom solution.

Create this php page and copy in plugin directory

<?php

/* Plugin Name: My Parameter

Plugin URI:  http://twitter.com/orfeomorello

Description: A plugin to allow parameter to be passed in the URL and recognized by WordPress

Author: Orfeo Morello

Version: 1.0

Author URI: http://twitter.com/orfeomorello

*/

add_filter('query_vars', 'parameter_queryvars' );

function parameter_queryvars( $qvars )

{

$qvars[] = 'myvar';

return $qvars;

}

?>

Install the Insert PHP plugin 

https://wordpress.org/plugins/insert-php/

Activate the plugin and create a wordpress page "myexample" to read the variable:

[insert_php]

global $wp_query;

if (isset($wp_query->query_vars['myvar']))

{

$myvar= urldecode($wp_query->query_vars['myvar']);

print myvar;

}

[/insert_php]

From the browser call the page

http://www.mywebsite.com/myexample/?myvar=123456