Sending and Receiving Cookies
This section describes how PHP supports cookies. setcookie() is the function to set a cookie to the HTTP response. $_COOKIE is the array containing cookies received in the next HTTP request.
PHP supports cookies with following elements:
1. setcookie() - A built-in function that defines a cookie to be sent in the HTTP response as a header line.
Like other header lines, cookies must be sent before any output from your script (this is a protocol restriction).
This requires that you place calls to this function prior to any output, including <html> and <head> tags
as well as any whitespace. If output exists prior to calling this function,
setcookie() will fail and return FALSE.
The syntax of calling setcookie() is:
bool setcookie(string name, string value, int expire)
- "name" is the name of this cookie.
- "value" is the value of this cookie. "value" is optional. If "value" is not provided, this cookie will be set
in the HTTP response without any value.
- "expire" is the time when this cookie should be expired. "expire" is optional. If "expire" is not provided,
this cookie will saved in browser memory only. If "expire" is provided, it represents a time in number of seconds
since the epoch. If the provided time is a future time, this cookie will be saved on the hard disk of the browser system.
For example, setcookie("user", "Herong") will set a cookie named as "user" in the HTTP response.
2. $_COOKIE - A built-in array that stores cookies returned back from the browser in the next HTTP request. Cookie names will be used
as array keys. For example, $_COOKIE["user"] returns the cookie value, "Herong", included in the HTTP request.
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
Creating and Managing Sessions in PHP Scripts
►Sending and Receiving Cookies in PHP Scripts
What Is a Cookie
►Sending and Receiving Cookies
Sending and Receiving Cookies - Example
ob_start() - Output Buffering Function
Persistent Cookies Saved on Hard Disk
Other Cookie Properties - Domain and Path
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