php - SQL - fatal error : Call to a member function bind_param() on a non-object

Question

假设我有这个 PHP 代码:

    $emailCheck = $_POST['emailCheck'];
    echo "Checking: " . $emailCheck; // Checking: test@test.net
    var_dump($stmt);
    $sql = "SELECT id, email FROM members WHERE email=?";
    $stmt = $mysqli->prepare($sql);
    $stmt->bind_param("s", $emailCheck);
    $stmt->execute();
    $stmt->bind_result($m_id, $m_email);
    $stmt->execute();

和我的数据库:

如您所见，我可以从 PHPMyAdmin 获取它。但是，PHP 页面是另一回事，因为我得到:

Fatal error: Call to a member function bind_param() on a non-object in...

违规行是:

$sql = "SELECT id, email FROM members WHERE email=?";

我做错了什么？

谢谢。

在执行 var_dump($stmt); 后，我得到:

object(mysqli_stmt)[4]
  public 'affected_rows' => null
  public 'insert_id' => null
  public 'num_rows' => null
  public 'param_count' => null
  public 'field_count' => null
  public 'errno' => null
  public 'error' => null
  public 'error_list' => null
  public 'sqlstate' => null
  public 'id' => null

编辑:尽管我尽可能地描述了，但我还是被否决了。优雅。

Answer 1

请使用 $mysqli->stat() 确保您的 mysql 连接正常。