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);
$msg = '<p>setted!</p>';
}
?>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>test</title><base>
</head>
<body>
<?php
if (isset($msg)){
print $msg;
}
?>
<p>Choose your preferences:</P>
<form action='ws.php' method='POST'>
<select name="font_size">
<option value=''>Font Size</option>
<option value='x-small'>x-small</option>
<option value='x-large'>x-large</option>
</select>
<select name="font_color">
<option value=''>Font Color</option>
<option value='999'>Gray</option>
<option value='0c0'>Green</option>
</select>
<input type="submit" name="submit" value="Set My Preferences"/>
<input type="hidden" name="submitted" value="true"/>
</form>
<pre name="code" class="html">
<div><p>This is the foot of the document</p></div>
</body>
</html>
二、session
1.session与cookie区别：
1>session将信息保存于服务器，cookie保存于客户端
2>session保存信息量更大
3>session更安全
2.创建session，注：必须在向web发信息之前调用
1>调用函数：session_start();
2>通过数组$_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:
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>test</title><base>
</head>
<body>
<?php
define('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".$SESSION['time'].'</h1>';
unset($_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
'<form action="ws.php" method="post">
<p> Name:<input type="text" name="name" size="20"/></p>
<p>Password:<input type="password" name="password" "size="20" /></p>
<input type="submit" value="send">
<input type="hidden" name="submitted" value="true"/>
</form>';
}
?>
<div><p>This is the foot of the document</p></div>
</body>
</html>