PHP Getting Started: session control skills (cookie and session); getting started with cookie

PHP Getting Started: session control skills (cookie and session); getting started with cookie

This article describes the PHP session control skills. We will share this with you for your reference. The details are as follows:

Demo1.php

<Form method = "get" action = "Demo2.php"> Name: <input type = "text" name = "username"/> <br/> <input type = "submit" value = "submit"/> </form>

Demo2.php

<? Php // echo $ _ POST ['username']; // if the form adopts get transmission, echo $ _ GET ['username'] must be accepted; // What is better .???? // $ _ POST ['']; is it safer?>

Demo3.php

<? Php // create a Cookie // Cookie is a small file stored on your client, this file contains your login information // setcookie can create a client's cookie file // The first parameter indicates the cookie name, the second parameter indicates the cookie name value // when the session ends, that is, when your browser is closed, it will disappear, automatically delete // create a cookie with an expiration date. The expiration time is based on the current timestamp + seconds. // time () + (7*24*60*60) indicates that the setcookie will change in the next 7 days. Once the browser is refreshed, the old cookie will overwrite the setcookie ('name', 'onestopweb', time () + (7*24*60*60);?>

Demo4.php

<? Php setcookie ('name', 'onestopweb'); // read the local cookie, using a super global variable $ _ COOKIE // put the cookie name in it. // There is a feature, setcookie is not generated in a timely manner. It will take a slow shot // PS: the first time it is refreshed, it will only overwrite the original generation. // But it is still obtained, and the second Refresh can be truly obtained. // Echo $ _ COOKIE ['name']; // use the variable detection function to determine whether the cookie exists if (isset ($ _ COOKIE ['name']). {echo $ _ COOKIE ['name'];} else {echo 'this user does not exist';}?>

Demo5.php

<? Php // Delete the cookie setcookie ('name', 'onestopweb '); // The cookie is deleted in the middle. // set this value to null. // setcookie ('name ',''); // when I adjust the expiration time to the current one second, the setcookie ('name', 'onestopweb', time ()-1) will expire ); echo $ _ COOKIE ['name'];?>

Demo6.php

<Form method = "post" action = "Demo7.php"> Name: <input type = "text" name = "username"/> <br/> <input type = "submit" value = "submit"/> </form>

Demo7.php

<? Php // if the specified name is the same, a cookie is generated // if (isset ($ _ POST ['username']) & $ _ POST ['username'] = 'onestopweb') {// if it is correct, I generate a cookie and redirect to setcookie ('name ', 'web'); header ('location: Demo8.php ');} else {header ('location: Demo6.php');}?>

Demo8.php

<? Php if (isset ($ _ COOKIE ['name']) {echo 'Welcome :'. $ _ COOKIE ['name'];} else {echo 'illegal logon';}?>

Demo9.php

<? Php session_start (); // account session processing // as long as the session is used, you must enable session_start () // at the beginning of the file // create a session, directly assign a value using the super global variable. // The session is stored on the server, which is generally stored for 1440 seconds. // If the webpage does not have any operation, it will be automatically destroyed. Of course, you can use php. ini to modify the Save time // If the browser is closed, it will be destroyed automatically. // Timeliness. It is not as slow as cookie. $ _ SESSION ['name1'] = 'onestopweb'; $ _ SESSION ['name2'] = 'onestopweb '; // echo $ _ SESSION ['name']; // if (isset ($ _ SESSION ['name']) {// echo $ _ SESSION ['name']; //} else {// echo 'does not exist. '; //} // The method is not deleted. // $ _ SESSION ['name'] = ''; // real deletion method // unset ($ _ SESSION ['name']); // if (isset ($ _ SESSION ['name']) {// echo $ _ SESSION ['name']; //} else {// echo 'does not exist. '; //}?>

Demo10.php

<? Php session_start (); // destroy all sessions, and destroy session_destroy (); echo $ _ session ['name1']; echo $ _ SESSION ['name2']; // cookie applies to member login, shopping cart... // Because it does not occupy server resources, there are many Members and a large number of shopping carts. Therefore, the cookie // session is generally used for background management and logon, with fewer users // security, will it automatically expire after a period of time?>