Alternative for mysql_num_rows using PDO (help) [closed] - php

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Need help using this in php 7 and pdo
// Фиксируем местоположение гостей
$movings = 0;
$session = md5(core::$ip . core::$ip_via_proxy . core::$user_agent);
$req = mysql_query("SELECT * FROM `cms_sessions` WHERE `session_id` = '$session' LIMIT 1");
if (mysql_num_rows($req)) {
// Если есть в базе, то обновляем данные
$res = mysql_fetch_assoc($req);
$movings = ++$res['movings'];
if ($res['sestime'] < (time() - 300)) {
$movings = 1;
$sql .= " `sestime` = '" . time() . "', ";
}
if ($res['place'] != $headmod) {
$sql .= " `place` = '" . mysql_real_escape_string($headmod) . "', ";
}
mysql_query("UPDATE `cms_sessions` SET $sql
`movings` = '$movings',
`lastdate` = '" . time() . "'
WHERE `session_id` = '$session'
");
} else {
// Если еще небыло в базе, то добавляем запись
mysql_query("INSERT INTO `cms_sessions` SET
`session_id` = '" . $session . "',
`ip` = '" . core::$ip . "',
`ip_via_proxy` = '" . core::$ip_via_proxy . "',
`browser` = '" . mysql_real_escape_string($agn) . "',
`lastdate` = '" . time() . "',
`sestime` = '" . time() . "',
`place` = '" . mysql_real_escape_string($headmod) . "'
");
}
I don't know how to do it