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How to communicate between php and html

PHPz

Apr 19, 2023 am 10:05 AM

Preface

In web development, PHP and HTML are both very important technologies. PHP is used to handle server-side requests and data processing, and HTML is used to build pages and user-side rendering. In practical applications, PHP and HTML often need to communicate, and how to achieve this communication is the basic knowledge that developers need to master.

1. The relationship between PHP and HTML

In the process of web development, PHP and HTML are usually used for different functions. PHP is used for server-side requests and data processing, and HTML is used for page building and user-side rendering. PHP provides great support and a way to link HTML and data sources.
In terms of the relationship between PHP and HTML, it can be summarized into the following two points:

PHP is responsible for data interaction with the database and sends the data to the user end by outputting HTML.
HTML is responsible for rendering the page on the user side, making requests to the server through forms, and interacting with the back-end PHP.

Whether it is front-end or back-end, HTML is inevitable. It is the most basic element of a web page and can be used to display page content. However, HTML can only display static, immutable content and cannot handle users' dynamic, interactive requests and data processing, and these functions require PHP to complete.

2. Commonly used PHP and HTML communication methods

Output HTML content through PHP

PHP programs can input and output different data types, such as Text, HTML, pictures, etc., the most relevant to HTML should be the output of HTML content. PHP can send HTML code to the browser through echo and print statements. Here is an example:

<?php
echo "<html>";
echo "<head><title>PHP and HTML</title></head>";
echo "<body>";
echo "<h1>PHP and HTML Communication</h1>";
echo "</body>";
echo "</html>";
?>

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Receive HTML form data via PHP

HTML forms are the most common way to collect user information. By filling out a form, users can send data to a PHP program on the server, where it will be processed. To process form data in PHP, you need to use the two global variables $_POST and $_GET, which can directly obtain the value passed by the HTML form. For example:

<html>
<body>

<form action="welcome.php" method="post">
    Name: <input type="text" name="name"><br>
    Email: <input type="email" name="email"><br>
    <input type="submit" value="Submit">
</form>

</body>
</html>

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When a user submits a form, the PHP code can obtain the data in the form in the following ways:

<?php
if(isset($_POST[&#39;name&#39;], $_POST[&#39;email&#39;])){
    $name = $_POST[&#39;name&#39;];
    $email = $_POST[&#39;email&#39;];
    
    //处理表单数据
}
?>

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Calling the API through PHP

When we need to get data from a remote server, we can call the API through PHP. API is a technology for communicating data to each other. By providing additional URL parameters, different response data can be returned. In PHP, communication with APIs can be achieved using the cURL library. The following is an API sample code:

<?php
//设置 API 地址
$api_url = "https://api.example.com/data";

//初始化 cURL
$curl = curl_init();

curl_setopt($curl, CURLOPT_URL, $api_url);
curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1);

//获取数据
$data = curl_exec($curl);

//关闭 cURL
curl_close($curl);

//处理获取到的数据
?>

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3. Summary

This article mainly introduces the communication method between PHP and HTML. Communication methods are mainly divided into three methods: outputting HTML content through PHP, receiving HTML form data through PHP, and calling API through PHP. PHP and HTML are both basic technologies for website development and can be combined to achieve various functions. Developers can flexibly use these methods according to specific needs to achieve the best development results.

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