How to implement second-level domain name access using cookies in php

This article mainly introduces how to implement second-level domain name access using cookies in php, compares common setcookie functions, and provides a class file for setting cookies to implement this function, it is a very practical technique. if you need it, you can refer to the following example to describe how cookies in php can be accessed by second-level domain names. Share it with you for your reference. The specific method is as follows:

Cookies are frequently used in some applications. suppose I have a multi-level domain name that requires simultaneous access to the cookies bound to the primary domain name, the following describes how to use setcookie in php to successfully access the cookie value of the primary domain name for a second-level domain name.

Sometimes the two domain names may be on different servers, but we still hope that the second-level domain names can smoothly access the cookies of the primary domain names, and the primary domain names can smoothly access the cookies of the second-level domain names, for example, SC .jb51.net wants to access cookies of www.jb51.net and blog.jb51.net.

The following describes three global cookie settings that you may frequently hear.

The first example code is as follows:

The code is as follows:

Setcookie ("jb51", $ s, time () + 3600*12, '/', '* .jb51.net ');

* No. a cookie cannot be set successfully.

The second example code is as follows:

The code is as follows:

Setcookie ("jb51", $ s, time () + 3600*12, '/', '.jb51.net ');

A global cookie is successfully set so that it can be correctly read under ss.jb51.net.

The third example code is as follows:

The code is as follows:

Setcookie ("jb51", $ s, time () + 3600*12, '/', 'jb51. net ');

A global cookie is successfully set and can be correctly read under ss.jb51.net.

This method can only be read by jb51.net. the test is successful in FireFox and the test is successful in IE. the code is as follows:

The code is as follows:

Setcookie ("jb51", $ s, time () + 3600*12, '/', 'SS .jb51.net ');

Set a cookie that can be correctly read only under the ss.jb51.net domain name. The standard saying on the network is .jb51.net. There is also a saying * (This statement is completely false ). we recommend a good php cookie operation class. you can set, retrieve, and delete cookies. the code is as follows:

The code is as follows:

<? Php
/**
* Php cookie
* Class: PHP_COOKIE
*/
Class PHP_COOKIE
{
Var $ _ name = "";
Var $ _ val = array ();
Var $ _ expires;
Var $ _ dir = '/'; // all dirs
Var $ _ site = '';
Function PHP_COOKIE ($ cname, $ cexpires = "", $ cdir = "/", $ csite = "")
{
$ This-> _ name = $ cname;
If ($ cexpires ){
$ This-> _ expires = $ cexpires;
}
Else {
$ This-> _ expires = time () + 60*60*24*30*12 ;//~ 12 months
}
$ This-> _ dir = $ cdir;
$ This-> _ site = $ csite;
$ This-> _ val = array ();
$ This-> extract ();
}
Function extract ($ cname = "")
{
If (! Isset ($ _ COOKIE )){
Global $ _ COOKIE;
$ _ COOKIE = $ GLOBALS ["HTTP_COOKIE_VARS"];
}
If (emptyempty ($ cname) & isset ($ this )){
$ Cname = $ this-> _ name;
}

If (! Emptyempty ($ _ COOKIE [$ cname]) {
If (get_magic_quotes_gpc ()){
$ _ COOKIE [$ cname] = stripslashes ($ _ COOKIE [$ cname]);
}
$ Arr = unserialize ($ _ COOKIE [$ cname]);
If ($ arr! = False & is_array ($ arr )){
Foreach ($ arr as $ var => $ val ){
$ _ COOKIE [$ var] = $ val;
If (isset ($ GLOBALS ["PHP_SELF"]) {
$ GLOBALS [$ var] = $ val;
}
}
}
If (isset ($ this) $ this-> _ val = $ arr;
}
// Remove the cookie globally
Unset ($ _ COOKIE [$ cname]);
Unset ($ GLOBALS [$ cname]);
}
Function put ($ var, $ value)
{
$ _ COOKIE [$ var] = $ value;
$ This-> _ val ["$ var"] = $ value;
If (isset ($ GLOBALS ["PHP_SELF"]) {
$ GLOBALS [$ var] = $ value;
}
If (emptyempty ($ value )){
Unset ($ this-> _ val [$ var]);
}
}
Function clear ()
{
$ This-> _ val = array ();
}
Function set ()
{
If (emptyempty ($ this-> _ val )){
$ Cookie_val = "";
}
Else {
$ Cookie_val = serialize ($ this-> _ val );
}

If (strlen ($ cookie_val)> 4*1024 ){
Trigger_error ("The cookie $ this-> _ name exceeds the specification for the maximum cookie size. Some data may be lost", E_USER_WARNING );
}
Setcookie ("$ this-> _ name", $ cookie_val, $ this-> _ expires, $ this-> _ dir, $ this-> _ site );
}
}
?>

I hope this article will help you with PHP programming.