PDO Mysql不正确返回结果

Question

Hi I'm stuck with this really weird situation.

I a mysql server and a app server. App connects to mysql via private network and i grant . privileges to both users.

This is my code from app server.

$db2 = new PDO('mysql:host=' . $host . ';dbname=' .$database. ';charset=utf8mb4', $userid, $db_password);
$db2->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
$db2->setAttribute(PDO::ATTR_EMULATE_PREPARES, false);


$somequery = $db2->query('SELECT mail,message_id from mc_mails');
$somequery->execute();

$somedata = $somequery->fetchAll(\PDO::FETCH_ASSOC);

pretty_print($somedata); //my own <pre>print_r()</pre> function

var_dump($somedata); //shows raw dump


//so below i try to do again in a try loop to get Exception, and there's no exception.
try {
    $somequery->execute();

    while ($row = $somequery->fetch(PDO::FETCH_ORI_NEXT)) {
        pretty_print($row);
    }

} catch (PDOException $e) {
    echo $e->getMessage();
}

The above yields me the following results

    **This is from pretty_print() **
Array
(
    [0] => Array
        (
            [mail] => 20
            [message_id] => <[e-mail]>
        )

    [1] => Array
        (
            [mail] => 21
            [message_id] => <[e-mail]>
        )

    [2] => Array
        (
            [mail] => 22
            [message_id] => 
        )

    [3] => Array
        (
            [mail] => 23
            [message_id] => 
        )

    [4] => Array
        (
            [mail] => 24
            [message_id] => 
        )

    [5] => Array
        (
            [mail] => 25
            [message_id] => 
        )

    [6] => Array
        (
            [mail] => 26
            [message_id] => 
        )

    [7] => Array
        (
            [mail] => 27
            [message_id] => <[e-mail]>
        )

    [8] => Array
        (
            [mail] => 28
            [message_id] => 
        )

    [9] => Array
        (
            [mail] => 29
            [message_id] => 
        )

    [10] => Array
        (
            [mail] => 30
            [message_id] => <[e-mail]>
        )

    [11] => Array
        (
            [mail] => 31
            [message_id] => <[e-mail]>
        )

    [12] => Array
        (
            [mail] => 34
            [message_id] => 
        )

    [13] => Array
        (
            [mail] => 35
            [message_id] => 
        )

)

** This is from var_dump() **
array(14) { [0]=> array(2) { ["mail"]=> int(20) ["message_id"]=> string(48) "<[e-mail]>" } [1]=> array(2) { ["mail"]=> int(21) ["message_id"]=> string(48) "<[e-mail]>" } [2]=> array(2) { ["mail"]=> int(22) ["message_id"]=> string(48) "" } [3]=> array(2) { ["mail"]=> int(23) ["message_id"]=> string(48) "" } [4]=> array(2) { ["mail"]=> int(24) ["message_id"]=> string(48) "" } [5]=> array(2) { ["mail"]=> int(25) ["message_id"]=> string(48) "" } [6]=> array(2) { ["mail"]=> int(26) ["message_id"]=> string(48) "" } [7]=> array(2) { ["mail"]=> int(27) ["message_id"]=> string(48) "<[e-mail]>" } [8]=> array(2) { ["mail"]=> int(28) ["message_id"]=> string(48) "" } [9]=> array(2) { ["mail"]=> int(29) ["message_id"]=> string(48) "" } [10]=> array(2) { ["mail"]=> int(30) ["message_id"]=> string(48) "<[e-mail]>" } [11]=> array(2) { ["mail"]=> int(31) ["message_id"]=> string(48) "<[e-mail]>" } [12]=> array(2) { ["mail"]=> int(34) ["message_id"]=> string(48) "" } [13]=> array(2) { ["mail"]=> int(35) ["message_id"]=> string(48) "" } }


** This is from fetch loop**
Array
(
    [mail] => 20
    [0] => 20
    [message_id] => <[e-mail]>
    [1] => <[e-mail]>
)
Array
(
    [mail] => 21
    [0] => 21
    [message_id] => <[e-mail]>
    [1] => <[e-mail]>
)
Array
(
    [mail] => 22
    [0] => 22
    [message_id] => 
    [1] => 
)
Array
(
    [mail] => 23
    [0] => 23
    [message_id] => 
    [1] => 
)
Array
(
    [mail] => 24
    [0] => 24
    [message_id] => 
    [1] => 
)
Array
(
    [mail] => 25
    [0] => 25
    [message_id] => 
    [1] => 
)
Array
(
    [mail] => 26
    [0] => 26
    [message_id] => 
    [1] => 
)
Array
(
    [mail] => 27
    [0] => 27
    [message_id] => <[e-mail]>
    [1] => <[e-mail]>
)
Array
(
    [mail] => 28
    [0] => 28
    [message_id] => 
    [1] => 
)
Array
(
    [mail] => 29
    [0] => 29
    [message_id] => 
    [1] => 
)
Array
(
    [mail] => 30
    [0] => 30
    [message_id] => <[e-mail]>
    [1] => <[e-mail]>
)
Array
(
    [mail] => 31
    [0] => 31
    [message_id] => <[e-mail]>
    [1] => <[e-mail]>
)
Array
(
    [mail] => 34
    [0] => 34
    [message_id] => 
    [1] => 
)
Array
(
    [mail] => 35
    [0] => 35
    [message_id] => 
    [1] => 
)

I've no idea why some of the arrays are empty. Notice the var_dump results shows there's string of 48 but it's still empty.

The loop also shows something in the array but it never gets printed. However, the exact same query I used directly in ssh gives me the following. All the fields are set.

I'm not sure whether that's the problem but my message_id is varchar(1000) - yes it's very big, but i'm just starting to learn about email headers and i read rfc is about 1000 chars for message-id though i doubt it ever go past that.

Need help please. I'm stocked.

EDIT: This happens in many fields too, i'm just choosing one field for clarity.

Answer 1

You're dumping into a browser, and those message IDs have <>, which means they're being rendered as unknown/illegal html tags. Do a view-source of the page, and you'll see they're there

I'm guessing the first two that DO show up were encoded with <...>, so they show as text, not rendered as html.