Подправка кода PHP

$res = $mysqli->query("SELECT SQL_CALC_FOUND_ROWS tb1.user_id, tb1.group_id, tb2.user_id FROM `groups_users` tb1,`groups_wall` tb2 WHERE tb1.user_id = '".$user_id."' AND tb1.group_id = tb2.wall_id");
$all = $res->num_rows;
$cp = ceil($all/$system['page']);
$p = (isset($_GET['page']) and is_numeric($_GET['page']) and $_GET['page']>1 and $_GET['page']<=$cp) ? $_GET['page'] : 1;
$start = $p*$system['page']-$system['page'];
$res = $mysqli->query("SELECT SQL_CALC_FOUND_ROWS 'groups' as 'request_type', tb1.user_id, tb1.group_id, tb2.id, tb2.user_id, tb2.wall_id, tb2.from, tb2.repost_id, tb2.text, tb2.photo, tb2.video, tb2.audio, tb2.type, tb2.time, tb2.crepost, tb2.urepost 
FROM `groups_users` tb1,`groups_wall` tb2 WHERE tb1.user_id = '".$user_id."' AND tb1.group_id = tb2.wall_id ORDER by tb2.time 
DESC LIMIT $start, ".$system['page']."");
 
if ($res->num_rows > 0 ) {
while ($news_groups_res = $res->fetch_array()){
$ord++;
$common_news[ $news_groups_res['time'] - $ord] = $news_groups_res;
}
}
 
$res = $mysqli->query("SELECT SQL_CALC_FOUND_ROWS DISTINCT tb1.friend_id, tb2.user_id 
FROM `friends` tb1,`wall` tb2 
WHERE       (tb1.user_id = '".$user_id."' OR tb2.user_id = '".$user_id."' )
AND tb1.friend_id = tb2.user_id
");
 
$all = $res->num_rows;
if ($all > 0){
$cp = ceil($all/$system['page']);
$p = (isset($_GET['page']) and is_numeric($_GET['page']) and $_GET['page']>1 and $_GET['page']<=$cp) ? $_GET['page'] : 1;
$start = $p*$system['page']-$system['page'];
 
$res = $mysqli->query("
SELECT SQL_CALC_FOUND_ROWS DISTINCT 'friends' as 'request_type', tb1.friend_id, tb1.status, tb2.id, tb2.user_id, tb2.wall_id, tb2.repost_id, tb2.text, tb2.photo, tb2.video, tb2.audio, tb2.type, tb2.time
FROM `friends` tb1, `wall` tb2 
WHERE (
( (tb1.user_id = '".$user_id."') AND (tb1.friend_id = tb2.user_id) AND tb1.status = '1') 
OR 
( (tb2.user_id = '".$user_id."') AND (tb1.friend_id = tb2.user_id) AND tb1.status = '1')
)
AND (tb2.wall_id = tb2.user_id)
ORDER by tb2.time DESC LIMIT $start, ".$system['page']."");
 
while ($news_friends_arr = $res->fetch_array()){
$ord++;
$common_news[ $news_friends_arr['time'] - $ord] = $news_friends_arr;
}
 
}
 
echo '<div id="load_content">';
if (isset($common_news)) {
krsort($common_news, SORT_NUMERIC);
foreach($common_news as $news) {
if ($news['request_type']=='friends') {
echo wall_post($news,1,0,1,1,0);
} else if ($news['request_type']=='groups') {
echo group_wall_post($news,1,0,1,1,0);
}
}
echo '</div>';
 
nav($p,$cp,'/modules/feed/nav/nav.php?id='.$id.'');
 
}else{
echo '<div class="no_content border-radius"><span class="material-icons">rss_feed</span> '.$lang['no_news'].'</div>';
}