I want to add some custom query string (when click on a column of a table) in the current url which has multiple query string in it. i have tried a lot to restructure the url but failed to do so. here some code which i have tried
global $wp;
// get current url with query string.
$current_url = home_url( $wp->request );
my html code
<tr>
<th class="table-heading directory-first-column table-sorting" scope="col">
<?php
if (isset($_GET) && $_GET['order'] == 'desc') {
$order = 'asc';
} else {
$order = 'desc';
}
?>
<a href="<?php echo $current_url.(!empty($_GET) && isset($_GET)) ? '&' : '?'; ?>sortby=last_name&order=<?php echo $order; ?>" class="sort-link">Profile Information</a>
</th>
<th class="table-heading table-sorting" scope="col">
<?php
if (isset($_GET) && $_GET['order'] == 'desc') {
$order = 'asc';
} else {
$order = 'desc';
}
?>
<a href="<?php echo $current_url.(!empty($_GET) && isset($_GET)) ? '&' : '?'; ?>sortby=host_university&order=<?php echo $order; ?>" class="sort-link">Host University</a>
</th>
<th class="table-heading table-sorting" scope="col">
<?php
if (isset($_GET) && $_GET['order'] == 'desc') {
$order = 'asc';
} else {
$order = 'desc';
}
?>
<a href="<?php echo $current_url.(!empty($_GET) && isset($_GET)) ? '&' : '?'; ?>sortby=field_of_study&order=<?php echo $order; ?>" class="sort-link">Field of Study</a>
</th>
<th class="table-heading directory-last-column table-sorting" scope="col">
<?php
if (isset($_GET) && $_GET['order'] == 'desc') {
$order = 'asc';
} else {
$order = 'desc';
}
?>
<a href="<?php echo $current_url.(!empty($_GET) && isset($_GET)) ? '&' : '?'; ?>sortby=program_year&order=<?php echo $order; ?>" class="sort-link">Program Year</a>
</th>
</tr>
how could i add & or ? in the url, if there is not query string then add ? if url has some query string the add & into it. any suggestion on it.
