How to create a PDO query for fetch with variables - php

Question

I am trying to build a PDO query for a large project to fetch SQL fetch queries. These SQL queries use variables to get values. I can't use the ones I get in the tutorials - I don't understand how to modify them to be able to use variables instead of :id for example. I have many many many files to update to PDO, because currently they are written using mysql()
An example of the query (one in of hundreds of files):
if(!$GLOBALS['this_brand']->id) return false;
if(!$GLOBALS['url_lang']) return false;
if(!$GLOBALS['this_region']->id) return false;
if(!$GLOBALS['this_type']->id) return false;
if(!$GLOBALS['this_user']->group) return false;
if(!$liveid = $GLOBALS['this_config']->get('config_live_id')) return false;
if(!$draftid = $GLOBALS['this_config']->get('config_draft_id')) return false;
if(!$archiveid = $GLOBALS['this_config']->get('config_archive_id')) return false;
if($GLOBALS['this_user']->is_admin()) {
$statussql = "AND (page.status = ".$liveid." OR page.status = ".$draftid." OR page.status = ".$archiveid.")";
}
else {
$statussql = "AND page.status = ".$liveid;
}
$the_statement = "SELECT * FROM page
LEFT JOIN _page_brand ON page.id = _page_brand.page_id
LEFT JOIN _page_language ON page.id = _page_language.page_id
LEFT JOIN _page_region ON page.id = _page_region.page_id
LEFT JOIN _page_type ON page.id = _page_type.page_id
LEFT JOIN _page_group ON page.id = _page_group.page_id
LEFT JOIN _page_section ON page.id = _page_section.page_id
WHERE _page_brand.brand_id = ".$GLOBALS['this_brand']->id."
AND _page_language.language_iso = '".$GLOBALS['url_lang']."'
AND _page_region.region_id = ".$GLOBALS['this_region']->id."
AND _page_type.type_id = ".$GLOBALS['this_type']->id."
AND _page_group.group_id = ".$GLOBALS['this_user']->group."
AND _page_section.section_id = ".$GLOBALS['this_section']->id."
".$statussql."
AND page.url = '".$this->url."'
ORDER BY page.status ASC, page.moddate DESC
LIMIT 1";
My PDO attempt (it looks really lame but I did try different ways, but removed the code once they didn't work):
public function fetchRaw($query){
$stmt = $this->db->query($query);
$arr = [];
foreach ($stmt as $row) {
$rarr = [];
foreach($row as $k=>$v) {
$rarr[$k] = $v;
}
$arr[] = $rarr;
}
return $arr;
}
I tried with the fetch(), the while loop etc. I cannot go and change each current query - there are thousands of them. Any help on how this should be approached will be appreciated. I am not an expert on PDO yet, and this huge project is a bit overwhelming, but I need to do this.