PHP PDO提取返回false

Question

I keep thinking on that "error" but can't say why it returns false. I've already done a SELECT for this but that is in an other file..

 $result = $db->dbh->prepare("SELECT thumbs FROM skill WHERE id=? LIMIT 1");
 $result->bindParam(1, $id);
    // $id == 4 here
 $result->execute();
 $row = $result->fetch(PDO::FETCH_ASSOC);
    // $row == false > why ?
 $thumbs = $row['thumbs'];

When i'm trying to run this on PhpMyAdmin, it works well.

I execute this code on an AJAX call, and using the same config.php file for the $db conection.

Another question:

    $sql_in = $db->dbh->prepare("INSERT INTO `voted_ip` (id, ip) VALUES (:id, :ip)");
    // $id == 4
    $sql_in->bindParam(":id", $id);
    $sql_in->bindParam(":ip", $ip, PDO::PARAM_STR);
    $sql_in->execute();

it inserts "0" and my ip. Why 0 ?

Please help

Answer 1

因为$ id是一个字符串，MySQL将该字符串转换为0。

$id = intval($id);