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Editorial Team
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Asked: 2026-06-12T18:01:40+00:00

$headers = ‘MIME-Version: 1.0’ . \r\n; $headers .= ‘Content-type: text/html; charset=iso-8859-1’ . \r\n; $headers

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     $headers  = 'MIME-Version: 1.0' . "\r\n";
     $headers .= 'Content-type: text/html; charset=iso-8859-1' . "\r\n";
     $headers .= 'From: contact@email.com';
     $to = $email;
     $subject = "Confirmation";
     $message = "Hi, $username. You're registred in Site. Link for confirmation:     http://site.com/confirm/**".mysql_insert_id()."**";
     mail($to, $subject, $message, $headers);
     $query = mysql_query("insert into usr_users(username, password, email, avator, pin)          values('$username', '$password', '$email', '$img', '$pin')");
     $query2 = mysql_query("insert into usr_confirm(user_name, user_id, active, data) values('$username', '".mysql_insert_id()."', '$active', '$senha')");
     echo"Success!</br>";

The second mysql_insert_id() (line 9) is correct! But the first mysql_insert_id() (line 6) return 0 in e-mail box.

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1 Answer

  1. Editorial Team

    Per the manual, mysql_insert_id() will return 0 if the last statement doesn’t generate an AUTO_INCREMENT value:

    The ID generated for an AUTO_INCREMENT column by the previous query on
    success, 0 if the previous query does not generate an AUTO_INCREMENT
    value    , or FALSE if no MySQL connection was established.

    You’re first using the mysql_insert_id() call before you’ve inserted any records, so the result has to be 0 (unless there’s a call before this somewhere else in your code -t hen you’d actually be getting skewed results). Try moving your mail-related calls to below your insert statements, giving you:

    // insert the records
$query = mysql_query("insert into usr_users(username, password, email, avator, pin)          values('$username', '$password', '$email', '$img', '$pin')");
$query2 = mysql_query("insert into usr_confirm(user_name, user_id, active, data) values('$username', '".mysql_insert_id()."', '$active', '$senha')");

// send the email
$headers  = 'MIME-Version: 1.0' . "\r\n";
$headers .= 'Content-type: text/html; charset=iso-8859-1' . "\r\n";
$headers .= 'From: contact@email.com';
$to = $email;
$subject = "Confirmation";
$message = "Hi, $username. You're registred in Site. Link for confirmation:     http://site.com/confirm/**".mysql_insert_id()."**";
mail($to, $subject, $message, $headers);
echo"Success!</br>";

    If you still receive the error after this change, you will need to confirm that your primary-key field on the usr_confirm table is correctly configured with auto_increment. Also, if it is setup properly, try passing the connection-variable to the function, such as mysql_insert_id($conn); where $conn is the result of your mysql_connect() call.

    Site note (not answer specific)
    Your code is extremely prone to SQL Injection; you’re not escaping any of the values. Rather than go into what SQL Injection is, I would much rather direct you to use Prepared Statements.

    In addition, PHP is deprecating the mysql_ methods in favor for the mysqli_ and PDO methods. Both of these support prepared statements and I would recommend for you to look into these.

    In the interim, please consider wrapping your variables with mysql_real_escape_string(), such as:

    ... values ('" . mysql_real_escape_string($username) . "', ...
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