無法弄清楚為什么我不斷收到此錯誤。閱讀了很多關于此的文章，但我不明白何時使用 stdClass() 以及何時不使用。代碼：$mysqli = new \stdClass();$mysqli->connection = new mysqli($mysql_db_hostname, $mysql_db_user, $mysql_db_password, $mysql_db_database);if($mysqli->connection->connect_error){    echo "Error: Failed to make a MySQL connection, here is why: \n";    echo "Errno: " . $mysqli->connect_errno . "\n";    echo "Error: " . $mysqli->connect_error . "\n";    exit;}else {    printf("Succesfully connected to database.");}$sql = "SELECT * from customer";if ($result = $mysqli->query($sql)) {    <<==== ERROR    printf("Success");}第一部分，連接到數據庫，似乎很順利。該錯誤在“if ($result = $mysqli->query($sql))”行上拋出。我嘗試將其更改為：if ($result = {object) $mysqli->query($sql))但這并沒有改變任何東西。