How to Use PHP in HTML

Easy to master the combination of PHP and HTML

Want to learn PHP and apply it to web development? This article will introduce several ways to embed PHP code into HTML to help you create dynamic web pages. We assume that you have the PHP environment installed in order to run the sample code in this article.

First of all, we provide a free online basics course to help you master the basics of PHP programming, from simple loops and functions to object-oriented programming (OOP), as well as core skills in web application development such as handling GET/POST requests, parsing JSON, user authentication, and MySQL databases.

Two main methods for combining PHP and HTML

There are two main methods to combine PHP with HTML:

1. Embing PHP code into .html file: This requires special configuration of the server to recognize and execute embedded PHP code. Normally, the server only processes files with .php extension.

2. Use .php file: This is the recommended method. Mix PHP and HTML code in a .php file and the server will automatically recognize and execute the PHP code.

Limitations of embedding PHP code in html file

If you try to embed PHP code directly in the

file, for example:

.html

By default, the server does not parse the PHP code inside it, but instead treats it as plain text output.

<h1><?php echo "Hello World"; ?></h1>

Recommended method: Combine PHP and HTML in .php file

To avoid the above problems, it is recommended that you put your PHP and HTML code in the

file.

.php

Use PHP function to include other files

In large projects, in order to improve code reusability and organization, PHP's

,

, include(), include_once(), require(), require_once() functions can be used to include other files.

• include() and include_once(): Contains the specified file. If the file does not exist, include() will issue a warning and continue execution, while include_once() will only be included once, avoiding repeated inclusions.

• require() and require_once(): Similar to include() and include_once(), but if the file does not exist, require() will raise a fatal error and stop script execution, and require_once() will also only contain it once.

Example: Use include() function

We create three files: header.php, date.php and day.php.

header.php:

<title>PHP与HTML结合</title>
<div>这是一个纯HTML信息。</div>
<div>接下来，我们将使用PHP显示今天的日期和星期几！</div>

date.php:

<?php
include('header.php');
?>
<div>
<?php
echo '今天的日期是 <b>' . date('Y/m/d') . '</b>!';
?>
</div>

day.php:

<?php
include('header.php');
?>
<div>
<?php
echo '今天是 <b>' . date('l') . '</b>!';
?>
</div>

date.php and day.php both include header.php. Open date.php and day.php in your browser and you will see the output result containing the header.php content.

Summary

This article introduces two methods to combine PHP with HTML, and demonstrates through examples how to use the include() function to include other files, thereby improving the reusability and organization of the code and simplifying the web development process.

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