How to read HTTP request headers in PHP

If you want to read request headers in PHP, you can use the getallheaders() function and the apache_request_headers() function. The following article will introduce you to the method of reading request headers in PHP. I hope it will be helpful to you.

What are the HTTP request headers?

Before understanding the HTTP request headers, let’s first take a look at the HTTP headers.

HTTP header: HTTP header is the code that transmits data between the web server and the browser. It is mainly used for two-way communication between the server and the client.

HTTP request headers:

When you type a URL into your browser's address bar and try to access it, your browser sends an HTTP request to the server.

HTTP request headers contain information in the form of text records, which include a lot of useful information such as the type, capabilities and version of the browser that generated the request, the operating system used by the client, the page requested, the browser Various types of output are accepted, etc.

After receiving the request headers, the web server sends HTTP response headers back to the client.

php reads request headers

1. Use the getallheaders() function

getallheaders The () function can obtain all the HTTP request header information of the current request; then return an array containing all the header information of the current request. If the acquisition fails, it will return FALSE.

Below we use an example to introduce how the getallheaders() function reads request headers.

<?php 
foreach (getallheaders() as $name => $value) { 
    echo "$name: $value <br>"; 
} 
?>

Output:

2. Use the apache_request_headers() function

apache_request_headers() function You can obtain all HTTP request header information for the current request.

<?php 
$header = apache_request_headers(); 
  
foreach ($header as $headers => $value) { 
    echo "$headers: $value <br />\n"; 
} 
?>

Output:

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