<?php
$db_hostname = 'localhost';
$db_database = 'social';
$db_username = 'root';
$db_password = '';

$connection = new mysqli($db_hostname,$db_username,$db_password, $db_database);
if ($connection->connect_error)   die  ($connection->connect_error);



if (isset($_POST['login']) && isset($_POST['pass'])) {
    $login = get_post($connection, 'login');
    $pass = get_post($connection, 'pass');
    $query = "INSERT INTO logins VALUES" .
        "('$login', '$pass')";
    $result=$connection->query($query);
}

echo <<<_a
<form method="post" action="123.php">
        <input type = "text" name="login">
        <input type="text" name="pass">
        <input type="submit" value="zareg">
    </form>
_a;


function get_post($connection, $var)
{
    return $connection->real_escape_string($_POST[$var]);
}
?>

после того как ввожу данные в форму вылазит это:

Deprecated: Automatically populating $HTTP_RAW_POST_DATA is deprecated and will be removed in a future version. To avoid this warning set 'always_populate_raw_post_data' to '-1' in php.ini and use the php://input stream instead. in Unknown on line 0


Warning: Cannot modify header information - headers already sent in Unknown on line 0

строки проверил и сохранял в кодировке UTF-8 без BOM

спасибо