SQL 查詢在 PHP 中返回 NULL 但在 PHPMyAdmin 中工作正常

Question

運行此代碼：

public function findBooking($start_date, $pitches, $nights, $people, $first_name, $last_name, $email){

    $error = false;
    $bookings = array();

    $this->db_connection = new mysqli(DB_HOST, DB_USER, DB_PASS, DB_NAME);
    if (!$this->db_connection->connect_errno) {
                   if((!$start_date == '') && (!$nights == '')){
            $end_date = date('Y-m-d', strtotime($start_date. ' + ' . ($nights-1) . ' days'));
        } else {
            $end_date = '';
        }

        $find_booking_sql = "SELECT * FROM booking LEFT JOIN camper ON booking.camper_id = camper.camper_id
                             WHERE (start_date LIKE  '%$start_date%')
                             AND (end_date LIKE  '%$end_date%') 
                             AND (pitches LIKE  '%$pitches%') 
                             AND (people LIKE  '%$people%')
                             AND (first_name LIKE  '%$first_name%')
                             AND (last_name LIKE  '%$last_name%')
                             AND (email LIKE  '%$email%')
                             ORDER BY start_date ASC";
        $find_booking_result = $this->db_connection->query($find_booking_sql);
        if ((!$find_booking_result->num_rows == 0)) {  
            // Not run
            }
        } else {
            $error = 'No bookings found';
        }

    }

    return array(
        'bookings' => $bookings,
        'error' => $this->db_connection->error,
        'debug' => $find_booking_sql,
        'result' => $find_booking_result
    );
}

在 PHP 中運行時返回current_field":null,"field_count":null,"lengths":null,"num_rows":null,"type":null ，但如果我從 PHPMyAdmin 運行 SQL，它工作正常。

我檢查過類似的問題，但解決方案不適用於此問題 - 我嘗試刪除 's，並且只有一個查詢正在運行。

示例生成的 SQL：

SELECT *
FROM booking
LEFT JOIN camper ON booking.camper_id = camper.camper_id
WHERE (start_date LIKE '%')
    AND (end_date LIKE '%')
    AND (pitches LIKE '%')
    AND (people LIKE '%')
    AND (first_name LIKE '%')
    AND (last_name LIKE '%') AND (email LIKE '%')
ORDER BY start_date ASC`

Answer 1

我的錯誤 - 我在實時的空數據庫上運行 PHP 查詢，但在登台數據庫上運行 PHPMyAdmin 查詢。

我切換了數據庫，原始代碼運行良好。