Run PHP function from HTML hyperlink

Does anyone have any experience doing this? I’m willing coding strategy if I can accomplish this another way. I don’t really know AJAX but it seems to me like this piece of code here is doing nothing:

if (isset($_GET['run'])) $linkchoice=$_GET['run'];
else $linkchoice='';

Hi all,

I’ve rewritten this a bit to see if I can get it to work, following jquery ajax tutorials.

I have moved the PHP function I want to execute to my functions.php file. My sidebar now looks like this:

<script type="text/javascript" src="https://ajax.googleapis.com/ajax/libs/jquery/1.8.3/jquery.min.js">
</script>
<h2>Show... </h2>
<script type="text/javascript">
function showAll() {
    $.get("addquery.php", { value:"" });
    return false;
}
function showAnimation() {
    $.get("addquery.php", { value:"animation" });
    return false;
}
function showPeople() {
    $.get("addquery.php", { value:"people" });
    return false;
}
function showResources() {
    $.get("addquery.php", { value:"resources" });
    return false;
}
function showStudios() {
    $.get("addquery.php", { value:"studios" });
    return false;
}
function showWiki() {
    $.get("addquery.php", { value:"wiki" });
    return false;
}
</script>
<a href="#" onclick="showAll();">All</a>
<a href="#" onclick="showAnimation();">Animation</a>
<a href="#" onclick="showPeople();">People</a>
<a href="#" onclick="showStudios();">Studios</a>
<a href="#" onclick="showResources();">Resources</a>
<a href="#" onclick="showWiki();">Wiki</a><br /><br />
<h2>Browse by topic... </h2>
<?php if ( function_exists('dynamic_sidebar') && dynamic_sidebar(7) ) : else : ?>
<?php endif; ?>

My “Addquery.php” file which I am using to execute the function looks like this:

<?php
$_GET['value'] = $value;
add_querystring_var($url, 'post_type', $value);
?>

But when I run the functions, nothing happens. I can see in chrome that the browser is trying to access “mysite.com/addquery.php?value=wiki” correctly and that it is receiving an error. The error is “Failed to load resource: the server responded with a status of 500 (Internal Server Error)”

Does anyone have any suggestions for how I might proceed?

What is it exactly you want to do?

for adding or removing a query variable to the URL you can use:
https://codex.www.ads-software.com/Function_Reference/add_query_arg
https://codex.www.ads-software.com/Function_Reference/remove_query_arg

keesiemeijer, thanks for responding! What I am trying to do is to make links in my sidebar which add a post_type argument to the existing query string of an archive page.

I didn’t know about these functions, hence why I was using the other ones. But I will definitely try them out. They look like they might do exactly what I was hoping for.

I’ve put in the new function but I still can’t figure out how to trigger it… will keep plugging away

Try adding the links like this on your archive pages:

<a href="<?php echo add_query_arg( 'myposttype', 'people' ); ?>">people<a>

With this in your theme’s functions.php you can add the post type to the normal post type “post” that’s normally displayed on archive pages:

function add_post_type($query) {
  if (!is_admin() && $query->is_main_query()){
    if (isset($_GET['myposttype']) && $_GET['myposttype']) {
      $post_types = get_post_types(array('public' => true, '_builtin' => false), 'names', 'and');
      if(!empty($post_types) && in_array($_GET['myposttype'], (array) $post_types)) {

        // add the post type from the url to the normal "post" post type
        $query->set('post_type', array('post', $_GET['myposttype']));

      }
    }
  }
};
add_action('pre_get_posts','add_post_type');

Amazing!! Works perfectly!!

I was under the impression that a PHP function couldn’t be run straight out of an HTML link without a separate script or AJAX, but I guess I was mistaken! This is much cleaner (and more functional) than what I was attempting!

Thanks so much!

You’re welcome. I’m glad you got it resolved ??