Information in $_GET and $_REQUEST
This section provides a tutorial example on how to dump information stored in the $_GET array and the $_REQUEST array.
Now try this URL, http://localhost/HttpRequestDetails.php?lang=PHP&search.
You should get:
Contents of $_GET:
lang = PHP
Contents of $_POST:
Contents of $_COOKIE:
Contents of $_REQUEST:
lang = PHP
Contents of $_SERVER:
QUERY_STRING = lang=PHP&search
- "?lang=PHP&search" attached at the end of the URL represents information submitted with the GET method.
- "?lang=PHP&search" is parsed by the PHP engine into 2 pairs of names and values and stored in the $_GET array.
- The PHP engine copied the same information from $_GET to $_REQUEST.
Note that if you are migrating scripts older than PHP 5.4.0,
you may see a sudden change on how quotes are passed in
$_POST, $_COOKIE, and $_REQUEST.
Before PHP 5.4.0, the PHP engine has a default option called
"magic_quotes_gpc", which turns on the "magic_quotes" state for GPC
GPC (Get/Post/Cookie) operations. When "magic_quotes" state is on,
all ' (single-quote), " (double quote), \ (backslash)
are escaped with a backslash automatically.
So scripts older than PHP 5.4.0 are using
stripslashes() function calls to clean up values received in $_POST, $_COOKIE, and $_REQUEST.
Now you must remove those stripslashes() function calls from older script.
If not removed, values received from client side may get damaged.
For example, "\\" will be received as "\".
Exercise: Try to find a way to test how to provide information with the POST method and how to provide cookies.
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
Full Version in PDF/EPUB