setcookie

Name:setcookie

Category:Network

Programming Language:php

One-line Description:Defines the cookie to be sent with the remaining HTTP headers.

Definition and usage

setcookie() function is used to define cookies sent with the remaining HTTP headers.

Cookies are often used to identify users. A cookie is a small file that the server embeds on the user's computer. Every time the same computer requests a page through the browser, it sends the cookie. Using PHP, you can create and retrieve cookie values.

The name of the cookie is automatically assigned to a variable with the same name. For example, if a cookie named "user" is sent, a variable named $user is automatically created, which contains the value of the cookie.

Note: setcookie() function must appear before the <html> tag.

Note: When sending a cookie, the value of the cookie will be automatically URL-encoded; when receiving, it will be automatically decoded (to prevent URL encoding, please use setrawcookie() instead).

grammar

 setcookie ( name , value , expire , path , domain , secure , httponly ) ;

Parameter value

parameter	describe
name	Required. Specify the name of the cookie.
value	Optional. Specifies the value of the cookie.
Expire	Optional. Specifies the expiration time of the cookie. The value time()+86400*30 will cause the cookie to expire after 30 days. If this parameter is omitted or set to 0, the cookie will expire at the end of the session (i.e. when the browser is closed). The default is 0.
path	Optional. Specifies the server path of the cookie. If set to "/", the cookies are available for the entire domain. If set to "/php/", cookies are only available for the php directory and all its subdirectories. The default value is the current directory where the cookie is set.
domain	Optional. Specify the domain name of the cookie. To make cookies available in all subdomains of example.com, set domain to "example.com". Setting it to www.example.com will make cookies available only in the www subdomain.
Secure	Optional. Specifies whether to transmit cookies only over a secure HTTPS connection. TRUE means that cookies are set only if a secure connection exists. The default is FALSE.
httponly	Optional. If set to TRUE, cookies can only be accessed via the HTTP protocol (cookies cannot be accessed through the scripting language). This setting helps reduce identity theft through XSS attacks. The default is FALSE.