用PHP计算面积

太过爱你忘了你带给我的痛 2022-12-07 12:08 139阅读 0赞

## 收集用户信息 **(** Collecting User Information **)** ##

Calculate Area

计算面积

`Calculate Area`

`Width:Length:`

Write the HTML to collect the length and width of a rectangle from the user. This document uses [PHP\_SELF][PHP_SELF] to send the information back to this page when the user submits his data. The script solicits three variables -- length, width, and calc. The calc variable is hidden and will be used in the next step of this process.

编写HTML以收集用户的矩形的长度和宽度。 当用户提交数据时，此文档使用[PHP\_SELF][PHP_SELF]将信息发送回此页面。 该脚本请求三个变量-长度，宽度和calc。 calc变量是隐藏的，将在此过程的下一步中使用。

## 做数学 **(** Doing the Math **)** ##

Results";
    print "The area of a rectangle $width x $length is $area

`"; } ?>`

This PHP script inserts under the

该PHP脚本插入

tag, and above the first

标签，并且在第一个标签上方

tag. This is the code that completes the calculation. This code is only executed if the calc variable exists, so if the user has not submitted a form yet, this code is ignored.

标签。 这是完成计算的代码。 仅当calc变量存在时才执行此代码，因此，如果用户尚未提交表单，则将忽略此代码。

The PHP collects the length and width variables and then multiplies them. It returns the answer to the user. The original form remains below so the user can complete another calculation if they need.

PHP收集长度和宽度变量，然后将它们相乘。 它将答案返回给用户。 原始表格保留在下面，因此用户可以根据需要完成其他计算。

## 完整代码 **(** Full Code **)** ##

The full script that integrates the PHP-based calculation with the HTML-based user-input wrapper appears below

下面显示了将基于PHP的计算与基于HTML的用户输入包装器集成在一起的完整脚本。

Calculate Area

计算面积

`Results"; print "The area of a rectangle $width x $length is $area`

`"; } ?>`

`Calculate Area`

`Width:Length:`

> 翻译自: [https://www.thoughtco.com/calculating-area-with-php-p2-2693841][https_www.thoughtco.com_calculating-area-with-php-p2-2693841]

[PHP_SELF]: https://www.thoughtco.com/using-server-in-php-2693940
[https_www.thoughtco.com_calculating-area-with-php-p2-2693841]: https://www.thoughtco.com/calculating-area-with-php-p2-2693841