Example to explain how to rewrite the header function in PHP
When using PHP for web development, the header() function is a very commonly used function. It can set HTTP response header information and implement page jumps and other functions. A question you may encounter is: how to rewrite the header function. This article will introduce you to how to rewrite the header function through a practical case.
1. Source of the problem
First, we try to create a PHP file index.php, which contains some interface display code and code for setting HTTP headers, as follows:
<html> <head> <title>Header Test</title> </head> <body> <h1>Header Test</h1> <?php // 设置 HTTP 头信息 header('Content-Type: text/html; charset=utf-8'); echo '这是一个测试页面'; ?> </body> </html>
Then, we visit the page and view the request header information in the browser's developer tools. We can see that Content-Type and other information are set correctly.
2. Requirements Analysis
Now, our requirement is to automatically add a custom HTTP response header information X-Powered-By: MyHeader when accessing the index.php page.
To achieve this requirement, our solution is to create a file named header.php and reference it in index.php.
The header() function needs to be rewritten in the header.php file, and custom HTTP header information needs to be added to the rewritten method.
3. Solution
In the header.php file, we define a new function my_header(), which internally uses PHP's native header() function to set the HTTP response header information , and added customized X-Powered-By: MyHeader header information in this setting. Then, we set the HTTP response header information by calling the my_header() function. The specific code is as follows:
<?php
function my_header($header) {
header("X-Powered-By: MyHeader");
header($header);
}
?>Next, at the top of the index.php file, we need to include the header.php file and set the HTTP header information by calling the my_header() function. The specific code is as follows:
<?php
// 引入 header.php 文件，其中定义了 my_header() 函数
include 'header.php';
// 调用 my_header() 函数来设置 HTTP 头信息（包含自定义的 X-Powered-By: MyHeader）
my_header('Content-Type: text/html; charset=utf-8');
// 输出网页内容
echo '<html>
<head>
<title>Header Test</title>
</head>
<body>
<h1>Header Test</h1>
这是一个测试页面
</body>
</html>';
?>Now, we visit the index.php page again and view the request header information in the browser's developer tools. We can see that the new X-Powered-By: MyHeader header information has been successfully set. .
4. Summary
This article uses a practical case to introduce how to implement customized settings of HTTP response header information by rewriting the header function. After our practice, we can see that by using the custom function my_header(), we can simply implement customized settings of header information, which greatly improves the flexibility and customizability of HTTP header information settings during our development process.
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