Cookie and session Analysis in PHP

1. php cookie
Cookie is a mechanism for storing data in a remote browser and tracking and identifying users.
PHP sends cookies in the HTTP header. Therefore, the setcookie () function must be called before other information is output to the browser, which is similar to the header () function.
1.1 set COOKIE:
You can use the setcookie () or setrawcookie () function to set the cookie. You can also set it by sending an HTTP header directly to the client.
1.1.1 use the setcookie () function to set the cookie:
Bool setcookie (string name [, string value [, int expire [, string path [, string domain [, bool secure [, bool HTTPOnly])
Name: Cookie variable name
Value: the value of the cookie variable.
Expire: the end time of the validity period,
Path: valid directory,
Domain: Valid domain name, unique in top-level domain
Secure: If the value is 1, the cookie can only be valid for HTTPS connections. If the default value is 0, both HTTP and HTTPS can be used.
Example:
<? PHP
$ Value = 'something from somewhere ';
Setcookie ("testcookie", $ value);/* simple cookie setting */
Setcookie ("testcookie", $ value, time () + 3600);/* valid for 1 hour */
Setcookie ("testcookie", $ value, time () + 3600 ,"/~ Rasmus/"," .example.com ", 1);/* valid directory /~ Rasmus, valid domain name example.com and all its subdomains */
?>
Set multiple COOKIE variables: setcookie ('var [a] ', 'value'); use an array to represent variables, but its subscript is not enclosed in quotation marks. in this way, you can use $ _ cookie ['var'] ['a'] to read the cookie variable.
1.1.2. Use header () to set the cookie;
Header ("Set-COOKIE: name = $ value [; Path = $ path [; domain = xxx.com [;...]");
The following parameters are the same as those listed in the setcookie function above.
For example:
$ Value = 'something from somewhere ';
Header ("Set-COOKIE: name = $ value ");*
......
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