Replace &ct_= with %2c or comma - php

Question

I've been wrestling with this function for far to long and I wish I had enough respect to offer a bounty. Help would be greatly appreciated.
// Advanced Search Check
function ct_search_form_check($name, $taxonomy_name = null) {
global $search_values;
if (!$taxonomy_name) {
$taxonomy_name = $name;
} ?>
<?php foreach( get_terms($taxonomy_name, 'hide_empty=0') as $t) : ?>
<?php if ($search_values[$name] == $t->slug) { $selected = 'checked="checked"'; } else { $selected = ''; } ?>
<div><input id="ct_<?php echo $name; ?>" name="ct_<?php echo $name; ?>" type="checkbox" style="margin-right:5px; margin-left:5px" <?php echo $selected; ?>value="<?php echo $t->slug; ?>"><?php echo $t->name; ?><span style="margin-left:10px"></span></input></div>
//recently added this part to replace duplicate taxonomy_name in url
<?php $data = array();
while (list($name, $t->slug) = each($arr)) {
$data[] = "$name";
}
echo implode($data); ?>
<?php endforeach; ?>
<?php
}
How do I change my output from
?ct_zipcode=&ct_event_type=alumni&ct_=anneverisy&ct_setting=ballroom&ct_=bar&Venue-search=true
to
?ct_zipcode=&ct_event_type=alumni%2canneverisy&ct_setting=ballroom%2cbar&Venue-search=true

Answer 1

This worked. hopefully it will help someone else
function ct_search_form_check($name, $taxonomy_name = null) {
global $search_values;
if (!$taxonomy_name) {
$taxonomy_name = $name;
} ?>
<input type="hidden" value="" name="ct_<?php echo $name; ?>" />
<?php foreach( get_terms($taxonomy_name, 'hide_empty=0') as $t) : ?>
<?php if ($search_values[$name] == $t->slug) { $selected = 'checked="checked"'; } else { $selected = ''; } ?>
<div><input id="ct_<?php echo $name; ?>" name="ct_<?php echo $name; ?>" type="checkbox" style="margin-right:5px; margin-left:5px" <?php echo $selected; ?>value="<?php echo $t->slug; ?>"><?php echo $t->name; ?><span style="margin-left:10px"></span></input></div>
<?php
$data = array();
while (list($name, $t->slug) = each($arr)) {
$data[] = "$name";
}
echo implode($data);
if (!empty($_GET['ct_'])) {
$url = str_replace('&ct_=', '%2c', $_SERVER['QUERY_STRING']);
header("Location: ?$url");
} ?>
<?php endforeach; ?>
<?php
}