php检查mysql时间戳

Question

I have the following function but have a problem in that my timestamp field in the database is a mysql timestamp type which is in format '2012-08-30 11:31:41' and the strtotime('-12 hours'); is giving a unix timestamp.

whats the solution?

public function checkIfItemVisited($user_id, $item_id) {

    $timeago = strtotime('-12 hours');
    $params = array(
        ':user_id' => $user_id,
        ':item_id' => $item_id,
        ':timestamp' => $timeago
    );
    $sql = "SELECT `visit_id` FROM `item_visits` WHERE `user_id` = :user_id AND `item_id` = :item_id AND `timestamp` > :timestamp";
    $stmt = $this->query($sql, $params);

    if($stmt->rowCount() > 0) :
        return false;
    else :
        $this->countVisit($user_id, $item_id);
    endif;
}

Answer 1

To solve your timestamp comparison problem, you can use UNIX_TIMESTAMP() in mysql

$sql = "SELECT `visit_id`
        FROM `item_visits`
        WHERE `user_id` = :user_id
               AND `item_id` =  :item_id
               AND UNIX_TIMESTAMP(timestamp) > :timestamp";