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Understand the three ways of embedding PHP in HTML

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Mar 05, 2024 pm 09:39 PM

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Understand the three ways of embedding PHP in HTML

PHP is a very commonly used server-side scripting language and is widely used in web development. In HTML, you can embed PHP code in three different ways, namely directly embedding, including files, and using PHP tags. Next, we will introduce each of these three embedding methods and provide code examples.

1. Directly embed PHP code
Direct embedding is the most common way, writing PHP code directly in HTML. For example, we can embed PHP code using the <?php ?> tag in the HTML file as follows:

<!DOCTYPE html>
<html>
<head>
    <title>直接嵌入PHP示例</title>
</head>
<body>
    <h1 id="直接嵌入PHP示例">直接嵌入PHP示例</h1>
    <?php
    // PHP代码块
    $name = 'Alice';
    echo 'Hello, ' . $name . '!';
    ?>
</body>
</html>

In this example, we use <?php ?> tag, and wrote a piece of PHP code in it to output "Hello, Alice!".

2. Include files
Another common way is to embed code by including external PHP files. This approach makes the code easier to maintain, manage, and reusable. Here is an example of including an external PHP file:

First, create a file containing the PHP code greeting.php:

<?php
$name = 'Bob';
echo 'Hello, ' . $name . '!';
?>

Then, pass # in the HTML file ##include or require statement to include the PHP file:

<!DOCTYPE html>
<html>
<head>
    <title>包含文件示例</title>
</head>
<body>
    <h1 id="包含文件示例">包含文件示例</h1>
    <?php include 'greeting.php';?>
</body>
</html>

Through the above example, we successfully included the code in the

greeting.php file HTML file, and achieve the effect of outputting "Hello, Bob!".

3. Use PHP tags

In addition to embedding and including files directly, you can also use PHP’s unique
= and tags to output content. An example is as follows:

<!DOCTYPE html>
<html>
<head>
    <title>使用PHP标记示例</title>
</head>
<body>
    <h1 id="使用PHP标记示例">使用PHP标记示例</h1>
    <p><?= 'Hello, PHP!' ?></p>
</body>
</html>

In this example, we use the

= tag to output "Hello, PHP!" and omit the echo statement, so that The code is more concise.

Summary:

Through the specific code examples of the above three embedding methods, I hope readers can have a deeper understanding of the embedding method of PHP in HTML, and flexibly apply it to actual Web development, improve development efficiency and increase Code maintainability.

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