多选PHP

Question

<form action="<?=$_SERVER['PHP_SELF']?>" method="post">
<select name="test[]" multiple="multiple">
    <option value="one">one</option>
    <option value="two">two</option>
    <option value="three">three</option>
    <option value="four">four</option>
    <option value="five">five</option>
</select>
<input type="submit" value="Send" />
</form>
<?php

    $test=$_POST['test'];
    if ($test){
     foreach ($test as $t){echo 'You selected ',$t,'<br />';}
    }
if($t=='one')
   $price1=12;
if($t=='two')
   $price2=2;
$total = $price1 + $price2;

echo $total;

当一和二都被选中时，我希望结果是14。做一个加法得到14的最好方法是什么？

Answer 1

您必须将if $t = one等放入循环中

Answer 2

你应该创建一个包含结果的变量，而不是创建price1、price2等。

例如：

<form action="<?=$_SERVER['PHP_SELF']?>" method="post">
<select name="test[]" multiple="multiple">
    <option value="one">one</option>
    <option value="two">two</option>
    <option value="three">three</option>
    <option value="four">four</option>
    <option value="five">five</option>
</select>
<input type="submit" value="Send" />
</form>

<?php

    $test = isset($_POST['test']) ? $_POST['test'] : null; // we also want to check if it's set else we'll get an notice
    $total = 0;

    if ($test) {
        foreach ($test as $t) {
            echo 'You selected ',$t,'<br />';

            switch ($t) {
                case "one" : $total += 2; break;
                case "two" : $total += 12; break;
            }
        }
    }

    echo 'Total: ' .$total;

Answer 3

将IF放入foreach循环中