PHP选择列表-在数据库中插入多个值

Question

<form enctype="multipart/form-data" action="" method="post">
            <select name="cars[]" multiple="multiple" style="width:300px">
            <?php 
            $getcars = mysql_query("SELECT cars_id, cars_name FROM car");
            while ($row = mysql_fetch_assoc($getcars)) {
                $car_id = $row['cars_id'];
                $car_name = $row['cars_name'];
            ?>
            <option value="<?php echo $car_id ?>"><?php echo $car_name ?></option>
            <?php } ?>
            </select><br />
            <input type="submit" name="submit" value="Submit"/><br/>
        </form> 

        $cars= $_POST['cars'];
        echo $cars;
        for($i = 0; $i < count($cars); $i++){
            echo $cars[$i];
            $carGroups = mysql_query("INSERT INTO car_groups VALUES('$company','$cars[$i]]')"); 
        }

Answer 1

有一个额外的封闭支架应该被移除。您不检查查询是否成功。

$carGroups = mysql_query("INSERT INTO car_groups VALUES('$company','$cars[$i]]')"); 

应该是：

$carGroups = mysql_query("INSERT INTO car_groups VALUES('$company','$cars[$i]')") or die(mysql_error()); 

由于$CARS是一个数组，您可以使用print_r或var_dump打印其内容：

print_r($cars);
var_dump($cars);