$list = array();
// hash looks like c:order(contains the data) and l:replyID(has the c:order for each reply so I can remove replies)
foreach($redis->hGetAll("reply_post:".$id) as $l => $r){
    if(substr($l,0,1) === "l"){continue;} // $l looks like l:203 | c:1  . And if $l has l in the first character then ignore
    $list[intval(substr($l,2))] = $r; // $l is now c:x and I want x to get the right order and c:x contains reply that which is $r
}
ksort($list,SORT_NUMERIC); // sort the array by numeric so the replies are in right order
foreach($list as $r){
    $c[$c_id]["post_replies"][] = $r;
}

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Or if I would use 2 redis hashes then it would look like this
foreach($redis->hGetAll("reply_post_list:".$id) as $l => $r){
    if($redis->hexists("reply_post".$id,"c:".$r)){
        $c[$c_id]["post_replies"][] = $redis->hget("reply_post".$id,"c:".$r);
    }
}