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php基础教程--3cookie和session

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Release: 2016-06-23 13:41:23
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一、cookie

1.创建cookie,注:必须在发送其他任何信心之前从服务器发送到客户端,否则导致错误。

   使用函数发送cookie: setcookie(name, value);

2.读取cookie

    eg:setcookie('user', 'trout');

     $COOKIE['user'];

3.添加参数

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

    参数简介:

     name键, value值,

     expiration存在时间,

     path和 domain限制在特定文件夹或域中才存在,

     sesure值1表必须使用安全连接,反之值0表不必要,

     httponly限制对cookie的访问,比如禁止Javascript对cookie的访问。

4.删除cookie

   使用通首次设置cookie时相同的参数,不设置值。

   eg:setcookie('user', 'larry');

   删除:setcookie('user', '');

编码测试:ws.php:

<?php if (isset($_POST['submitted'])){	setcookie('font-size', $_POST['font_size'], time() + 1000000000, '/', '', 0);	setcookie('font-color', $_POST['font_color'], time() + 1000000000, '/', '', 0);	$msg = '<p>setted!';}?>   <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <title>test</title><base>   <?phpif (isset($msg)){	print $msg;}?><p>Choose your preferences:</p>
Copy after login
<div><p>This is the foot of the document</p></div>  
Copy after login


二、session

1.session与cookie区别:

    1>session将信息保存于服务器,cookie保存于客户端

    2>session保存信息量更大

    3>session更安全

2.创建session,注:必须在向web发信息之前调用

   1>调用函数:session_start();

   2>通过数组$_SESSION进行数值记录:$_SESSION[' email '];

3.访问session:

   $_SESSION[' email '];

4.删除session:session数据存在两个地方,故从两个地方删除:

   1>session_start()

   2>unset($_SESSION);

   3>session_destory(); //删除服务器上的

编码测试:ws.php:

   <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <title>test</title><base>   <?phpdefine ('TITLE', 'Login');if (isset($_POST['submitted'])) {	if ((!empty($_POST['name'])) && (!empty($_POST['password']))){		if ((strtolower($_POST['name']) == 'yf') && ($_POST['password'] == '123456')){// name and password are correct.			session_start();			$SESSION['name'] = $_POST['name'];			$SESSION['time'] = time();						print '<h1>The session content:' .$SESSION['name']."\n".$SESSION['time'].'';						unset($_SESSION);			session_destroy();			print 'destroy()!';		}		else {			print '<p> name or password is worry!</p>';		}	}	else {		print '<p> make sure you enter both name and password!</p>';	}}else {	print 		'
Copy after login

Name:

Password:

'; }?><div><p>This is the foot of the document</p></div>

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