Web Server Information in $_SERVER

This section provides a tutorial example on how to dump Web server information stored in the $_SERVER array.

Now, let's run HttpRequestDetails.php on the local Apache Web server. First copy HttpRequestDetails.php to \apache\htdocs, then run Internet Explorer (IE) with http://localhost/HttpRequestDetails.php. You should get:

Contents of $_GET:

Contents of $_POST:

Contents of $_COOKIE:

Contents of $_REQUEST:

Contents of $_SERVER:
   REDIRECT_HANDLER = application/x-httpd-php
   HTTP_HOST = localhost
   HTTP_CONNECTION = keep-alive
   HTTP_REFERER = http://localhost/
   HTTP_ACCEPT_ENCODING = gzip, deflate, br
   HTTP_ACCEPT_LANGUAGE = en-US,en;q=0.9
   SystemRoot = C:\windows
   COMSPEC = C:\windows\system32\cmd.exe
   WINDIR = C:\windows
   SERVER_SOFTWARE = Apache/2.4.37 (Win64)
   SERVER_NAME = localhost
   SERVER_ADDR = ::1
   REMOTE_ADDR = ::1
   DOCUMENT_ROOT = C:/apache/htdocs

Note that $_GET, $_POST, $_COOKIE, and $_REQUEST are still all empty, because HTTP request contains no information submitted using the GET or POST method. And there are no cookies in the HTTP request.

However, other information contained in the HTTP request and gathered from the Web server is stored in the $_SERVER array now. For example, "DOCUMENT_ROOT = c:/apache/htdocs" is piece of information from the Web server telling us that the Web server picks up HTTP documents and scripts from the c:/apache/htdocs directory.

Table of Contents

 About This Book

 Introduction and Installation of PHP 7.3

 PHP Script File Syntax

 PHP Data Types and Data Literals

 Variables, References, and Constants

 Expressions, Operations and Type Conversions

 Conditional Statements - "if" and "switch"

 Loop Statements - "while", "for", and "do ... while"

 Function Declaration, Arguments, and Return Values

 Arrays - Ordered Maps

 Interface with Operating System

 Introduction of Class and Object

 Integrating PHP with Apache Web Server

Retrieving Information from HTTP Requests

 Predefined Variables Related to HTTP Requests

 Operating System Information in $_SERVER

Web Server Information in $_SERVER

 Information in $_GET and $_REQUEST

 Registering $_REQUEST Keys as Global Variables

 Creating and Managing Sessions in PHP Scripts

 Sending and Receiving Cookies in PHP Scripts

 Controlling HTTP Response Header Lines in PHP Scripts

 Managing File Upload

 MySQL Server Connection and Access Functions

 Functions to Manage Directories, Files and Images

 SOAP Extension Function and Calling Web Services

 SOAP Server Functions and Examples

 Localization Overview of Web Applications

 Using Non-ASCII Characters in HTML Documents

 Using Non-ASCII Characters as PHP Script String Literals

 Receiving Non-ASCII Characters from Input Forms

 "mbstring" Extension and Non-ASCII Encoding Management

 Managing Non-ASCII Character Strings with MySQL Servers

 Parsing and Managing HTML Documents

 Configuring and Sending out Emails

 Image and Picture Processing

 Managing ZIP Archive Files

 Managing PHP Engine and Modules on macOS

 Managing PHP Engine and Modules on CentOS

 Outdated Tutorials


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