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Question

In my site I am in the following page:

mysite.com/especialidad/ensenanza/formacion-profesional/?region=alava

The relevant part of the PHP template that contains that page is:

<?php
    /* Get the Queried Object */
    $term = get_queried_object();

    $enlace_especialidad = get_term_link( $term );

    /* Get the Queried Object */
    $user_query = new WP_User_Query(
        array(
            'meta_key' => 'especialidad_preparador',
            'meta_value' => $term->term_id,
            'number' => 100,

            'meta_query' => $meta_query,
        )
    );
?>
<?php echo $enlace_especialidad; ?>
<h1 class="titulo_taxonomia">Preparadores de Oposiciones a <a href="<?php $enlace_especialidad ?>"><?php echo $term->name ?></a>
<?php 
    if ($_GET['region']) {
        $taxonomia_region = get_term_by('slug', $_GET['region'], 'region');

        echo 'en <a href="'. get_term_link( $taxonomia_region ) .'">'. $taxonomia_region->name .'</a>';
    }
?>

When I echo the var $enlace_especialidad (just to check its value) the result is:

mysite.com/especialidad/ensenanza/formacion-profesional/

Instead, the part that refers to the URL: Preparadores de Oposiciones a <a href="<?php $enlace_especialidad ?>"><?php echo $term->name ?></a> links to:

mysite.com/especialidad/ensenanza/formacion-profesional/ ?region=alava

The problem is that ?region=alava isn't in the var $enlace_especialidad, and I don't know how it appears when used in an anchor. On the other hand it is the current page URL, and I guess there must be a relation.

Answer 1

LAST EDIT

You forgot to echo before the link, so the anchor is void. That's why you see incoherence with the printed output before.

---

?region=alava is here because it is a result of a $_GET request with region as parameter. So it is in addition of your URL part.

So your URL is just fine, the additionnal part is treated in this followed part :

<?php 
    if ($_GET['region']) {
        $taxonomia_region = get_term_by('slug', $_GET['region'], 'region');

        echo 'en <a href="'. get_term_link( $taxonomia_region ) .'">'. $taxonomia_region->name .'</a>';
    }
?>

The part with get_term_link( $taxonomia_region ) contains the $_GET['region'] result part if it exist.

See documentation of $_GET : http://php.net/manual/en/reserved.variables.get.php

EDIT

After our discussion in the comment, there's a difference with this method when you use different kind of parameter, ie get_term_link( $term ); or get_term_link( $taxonomia_region );

Since the term can be an object, integer, or string, make sure that any numbers you pass in are explicitly converted to an integer (example: (int) $term_id). Otherwise the function will assume that $term is a slug instead of a term ID.

That's why you get mysite.com/especialidad/ensenanza/formacion-profesional/ with get_term_link( $taxonomia_region ); because you pass a slug as parameter.

And you get mysite.com/especialidad/ensenanza/formacion-profesional/?region=alava with get_term_link( $term ); because you pass an object as parameter.

Source : https://developer.wordpress.org/reference/functions/get_term_link/