如何编写基于七个值生成派对费用表的代码？

这应该是一个好的开始。

//the (int) changes the input to an integer, which will help prevent code injection.
//$_GET takes variables from the URL string, like http://google.com?min=30&max=60
//$_POST takes variables from a form on the page that then gets submitted <input type="text" name="min" value="30" />
$min = (int) $_GET['min'];
$max = (int) $_GET['max'];

$costs = array(
  '5',
  '10',
  '15',
  '20',
  '25',
);

echo '<table>';

for($i = $min; $i <= $max; $i++)
{
    //if the number is divisible by 5, show it in the table
    if($i % 5 === 0)
    {
        echo '<tr>';
        echo '<td>' . $i . '</td>';

        foreach($costs as $cost)
        {
            echo '<td>' . $cost . '<br>' . $cost * $i . '</td>';
        }

        echo '</tr>';
    }
 }

echo '</table>';

结果表将是：

30150300450600750

35175350525700875

等等...直到60（包括）。