Php basic tutorial-3 cookie and session

Php basic tutorial-3 cookie and session I. cookie

1. create a cookie. note: The cookie must be sent from the server to the client before any other confidence is sent; otherwise, an error occurs.

Use the function to send a cookie: setcookie (name, value );

2. read cookie

Eg: setcookie ('user', 'trout ');

$ COOKIE ['user'];

3. Add parameters

Set (name, value, expiration, path, domain, sesure, httponly );

Parameter introduction:

Name key, value,

Expiration Time,

Path and domain are restricted to exist in a specific folder or domain,

The sesure value 1 table must use a secure connection. Otherwise, the value 0 table is unnecessary,

Httponly restricts access to cookies, such as disabling Javascript access to cookies.

4. delete a cookie

The same parameter when the cookie is set for the first time. no value is set.

Eg: setcookie ('user', 'Larry ');

Delete: setcookie ('user ','');

Code test: ws. php:

 Setted!
';}?>   
  Test   
 
Choose your preferences:
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  II. session  
  
1. differences between session and cookie:
  
1> session stores information on the server and cookie on the client
  
2> session stores more information
  
3> safer session
  
2. create a session. note: it must be called before sending a message to the web.
  
1> call the function: session_start ();
  
2> use the array $ _ SESSION to record the value: $ _ SESSION ['email '];
  
3. access session:
  
$ _ SESSION ['email '];
  
4. delete session: the session data exists in two places, so it is deleted from two places:
  
1> session_start ()
  
2> unset ($ _ SESSION );
  
3> session_destory (); // delete
  
Code test: ws. php:
  
  
   
   test   
   name or password is worry!
';}}else {print '
 make sure you enter both name and password!
';}}else {print '';}?>
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