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我只是有一个奇怪的准备语句失败，我不知道为什么

function send_notification($notification_member_ID,$notification_activity_type,$notification_parent_ID,$notification_parent_type){
  global $mysqli;
  $stmt = $mysqli->prepare("INSERT INTO notifications (`notification_member_ID`, `notification_activity_type`, `notification_parent_ID`, `notification_parent_type`) VALUES ( ? , ? , ? , ? )");
  $stmt->bind_param('iiii', $notification_member_ID, $notification_activity_type, $notification_parent_ID, $notification_parent_type);
  if($stmt->execute()){
    return 1;
  }else{
    error_log("!send_notification(mysqli,$notification_member_ID,$notification_activity_type,$notification_parent_ID,$notification_parent_type) at ".date("Y-m-d H:i:s",time())."\n", 3, "{$dir_error_log}/transaction.log");
  }
}

这是我失败的调试尝试

$product_ID=2;
$stmt = $mysqli->prepare("SELECT product_holder_ID FROM market where product_ID=? ");
$stmt->bind_param('i', $product_ID);
$stmt->execute();
$stmt->bind_result($product_holder_ID);
while($stmt->fetch()){
    $mysql->send_notification($product_holder_ID,'1',$product_ID,'1');
}

致命错误：在非对象上调用成员函数 bind_param()

如果我将它移出循环，我会成功

$product_ID=2;
$stmt = $mysqli->prepare("SELECT product_holder_ID FROM market where product_ID=? ");
$stmt->bind_param('i', $product_ID);
$stmt->execute();
$stmt->bind_result($product_holder_ID);
while($stmt->fetch()){
}
$mysql->send_notification($product_holder_ID,'1',$product_ID,'1');

里面的黑盒子是什么让它在第一次尝试时出错？

更多信息：

$mysqli- 错误：命令不同步；你现在不能运行这个命令

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