droc60607 2014-09-11 07:12
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PHP嵌套ifs和许多条件不起作用

I have many nested ifs and conditions in my code but it is not giving the desired output. What is the best way to write the following code :

$driver_code = $this->input->post('filter_driver_code');

        $unit_code = $this->input->post('filter_unit_code');

        $fuel_type = $this->input->post('filter_fuel');

        $date_to = $this->input->post('date_to');

        $date_from = $this->input->post('date_from');





        if (isset($date_from) and isset($date_to) and empty($unit_code) and empty($driver_code) and empty($fuel_type)) {

            $sql = "SELECT * FROM fuel_usage where (date between '$date_from' and '$date_to') ";
            $result = $this->db->query($sql);
        } elseif (isset($driver_code) and isset($unit_code) and isset($fuel_type) and isset($date_from) and isset($date_to)) {

            $sql = "SELECT * FROM fuel_usage where driver_code='$driver_code' AND unit_code='$unit_code' AND fuel_type='$fuel_type' and (date between '$date_from' and '$date_to')";
            $result = $this->db->query($sql);
        }  elseif (empty ($date_from) and empty ($date_to) and isset ($unit_code) and isset ($driver_code) and isset ($fuel_type)) {

            $sql = "SELECT * FROM fuel_usage where driver_code='$driver_code' AND unit_code='$unit_code' AND fuel_type='$fuel_type'";
            $result = $this->db->query($sql);
        }  else {
            $sql="SELECT * FROM FUEL_USAGE";
            $result = $this->db->query($sql);
        }

It does not give the right output.

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2条回答 默认 最新

  • dqdz6464 2014-09-11 07:19
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    Try all check with empty() may be isset() gives you problem cause on post isset for all variable will return true even values blank

           if (!empty($driver_code) && !empty($unit_code) && !empty($fuel_type) && !empty($date_from) && !empty($date_to)) {
                $sql = "SELECT * FROM fuel_usage where driver_code='$driver_code' AND unit_code='$unit_code' AND fuel_type='$fuel_type' and (date between '$date_from' and '$date_to')";
                $result = $this->db->query($sql);
            }elseif (!empty($date_from) && !empty($date_to) && empty($unit_code) && empty($driver_code) && empty($fuel_type)) {
                $sql = "SELECT * FROM fuel_usage where (date between '$date_from' and '$date_to') ";
                $result = $this->db->query($sql);
            }  elseif (empty($date_from) && empty($date_to) && !empty($unit_code) && !empty($driver_code) && !empty($fuel_type)) {
                $sql = "SELECT * FROM fuel_usage where driver_code='$driver_code' AND unit_code='$unit_code' AND fuel_type='$fuel_type'";
                $result = $this->db->query($sql);
            }  else {
                $sql="SELECT * FROM FUEL_USAGE";
                $result = $this->db->query($sql);
            }
    

    or try in short way

    $sql = "SELECT * FROM fuel_usage where 1 ";
    if (!empty($driver_code)) {
      $sql .= " AND driver_code='$driver_code' ";
    } 
    if (!empty($unit_code)) {
      $sql .= " AND unit_code='$unit_code' ";
    } 
    if (!empty($fuel_type)) {
      $sql .= " AND fuel_type='$fuel_type' ";
    } 
    if (!empty($date_from) && !empty($date_to)) {
      $sql .= " AND date between '$date_from' and '$date_to' ";
    }
    $result = $this->db->query($sql); 
    
    本回答被题主选为最佳回答 , 对您是否有帮助呢?
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