Detailed example of how to implement form exchange in PHP

With the rise of web applications, forms have become one of the most common elements in web development. Forms are one of the main ways for users to interact with web applications. They can be used to collect user information, submit data, conduct searches, display data, etc. In the process of developing web applications, it is often necessary to operate and process forms. The most basic operation is the input and output of form data. In this article, I will introduce how to use PHP to implement form exchange functions.

1. What is form exchange?

Form exchange refers to the process of transferring data from one form to another form in Web development. For example, if the user enters some data into a form and then submits the form, the data will be passed to another form for display or other processing. Form exchange usually requires the use of server-side scripting languages ​​such as PHP.

2. Steps to implement form exchange

1. Create the first form

First, we need to create a basic HTML form to collect data. The following is a simple form example:

nbsp;html>


    <title>表单互换</title>


    

        姓名：         
        年龄：         
        性别：         男         女
             

In this form, we define the form through the <form></form> element and specify the target file for form submissionshow. php and the submission method is post. At the same time, we created three form elements to collect user data, namely input box<input type="text"> and radio button<input type="radio"> , and specify the name attribute and value attribute for them respectively.

2. Create a second form

Create a second form to display the data submitted in the first form. The following is the HTML code of the second form:

nbsp;html>


    <title>展示数据</title>


    <h1 id="您提交的数据如下">您提交的数据如下：</h1>
    <p>姓名：<?php  echo $_POST[&#39;name&#39;];?></p>
    <p>年龄：<?php  echo $_POST[&#39;age&#39;];?></p>
    <p>性别：<?php  echo $_POST[&#39;gender&#39;];?></p>
    <a>返回</a>

In this form, we output the data submitted in the first form through PHP language. <?php echo $_POST['name'];?> means outputting the value of the form element named name in the first form, and so on for the values ​​of the other two form elements. . At the same time, we provide a return link so that users can return to the first form and re-enter data.

3. Create a PHP processing script

Next, we need to create a PHP file to process the data submitted by the first form and pass the data to the second form for display. The following is a sample code for processing the script:

nbsp;html>


    <title>表单处理</title>


    <?php         if($_POST[&#39;name&#39;] && $_POST[&#39;age&#39;] && $_POST[&#39;gender&#39;]){ //判断是否提交数据
            $name = $_POST[&#39;name&#39;];
            $age = $_POST[&#39;age&#39;];
            $gender = $_POST[&#39;gender&#39;];
            header("Location: show.php?name=$name&age=$age&gender=$gender"); //跳转到展示数据页面
        }else{
            echo "请填写完整的表单数据！";
        }
    ?>

In this script, we first determine whether the user has submitted complete form data, and then store the form data into variables and use header The function jumps to the display data page show.php, and passes the form data to the display page through URL parameters. If the user does not fill in complete data, prompt the user to fill in complete form data.

3. Summary

Through the above steps, we have completed a basic form exchange function. After the user fills out the first form, submitting the form will jump to the display data page. The display page can display the data submitted by the user and provide a return link so that the user can return to the first form and re-enter the data. In actual development, the process and implementation methods of form exchange will vary according to different needs. But the basic idea is the same, which is to use server-side scripting language to process form data and pass the data to where it is needed for display or other processing.

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