提交以下表单时，我收到此错误：
Fatal error: Call to undefined function mysqli_connect() in .... mailing_list_include.php on line 7
这里是mailing_list_include.php文件 - 真正的东西包括访问数据库的正确凭据
function doDB() {
global $mysqli;
// connect to server and select database; you may need it
$mysqli = mysqli_connect("localhost", "username",
"password", "db");
// if connection fails, stop script execution
if (mysqli_connect_errno()) {
printf("Connect failed: %s\n", mysqli_connect_error());
exit();
}
}
function emailChecker($email) {
global $mysqli, $check_res;
//check that email is not already in list
$check_sql = "SELECT id FROM SUBSCRIBERS
WHERE email = '".$email."'";
$check_res = mysqli_query($mysqli, $check_sql)
or die(mysqli_error($mysqli));
}
?>
