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php自定文件保存session的方法_PHP

May 31, 2016 pm 06:15 PM
php session keep document

本文实例讲述了php自定文件保存session的方法。分享给大家供大家参考。具体实现方法如下:

session.inc.php文件:定义session的文件存储,session解决方案,就是要提供在php脚本中定义全局变量的方法,使得这个全局变量在同一个session中对于所有的php脚本都有效,我们都知道,session不是一个简单的时间概念,一个session中还包括了特定的用户和服务器,因此更详细地讲,在一个session定义的全局变量的作用范围,是指这个session所对应的用户所访问的所有php,例如a用户通过session定义了一个全局变量$user="wind"中,而b用户通过session定义的全局变量$user="jane",那么在a用户所访问的php脚本中,$user的值就是wind.

php如何创建session

开始介绍如何创建 session,非常简单,启动 session 会话,并创建一个 $admin 变量:

启动 session:

session_start();

声明一个名为 admin 的变量,并赋空值:$_session["admin"] = null;

如果你使用了 seesion,或者该 php 文件要调用 session 变量,那么就必须在调用 session 之前启动它,使用 session_start() 函数,其它都不需要你设置了,php 自动完成 session 文件的创建,执行完这个程序后,我们可以到系统临时文件夹找到这个 session 文件,一般文件名形如:sess_4c83638b3b0dbf65583181c2f89168ec,后面是 32 位编码后的随机字符串,用编辑器打开它,看一下它的内容:admin|n;,PHP实例代码如下:

代码如下:

//定义一个超全局数组
$_session = array();
//定义文件句柄
$fp = null;
 
//用户自定义的开启session函数
function session_file_start() {
 
//1. 首先判断浏览器有没有发送cookie值
if (isset($_cookie['fileid'])) {
 
//2. 接收cookie值
$filename = $_cookie['fileid'];
 
//3. 打开文件,用于读写
if (file_exists($filename)) {
$globals['fp'] = fopen($filename, 'r+');
} else {
$globals['fp'] = fopen($filename, 'w+');
}
} else {
//2. 设置一个文件,并把该文件名放到cookie中
$filename = date('ymdhis');
setcookie('fileid', $filename, time()+60*60*24);
 
//3. 打开文件,用于读写
$globals['fp'] = fopen($filename, 'w+');
 
} //end of if-else
 
//4. 把文件中的数据存储到超全局数组$_session中
while (!feof($globals['fp'])) {
//读取文件中的一行
$buffer = fgets($globals['fp']);
//处理所读取的这一行
$tmparr = explode('=', trim($buffer, 'rn'));
 
//添加到session数组中
if (count($tmparr) == 2) {
$globals['_session'][$tmparr[0]] = $tmparr[1];
}
} //end of while
 
} //end of session_file_start()
 
//注册会话变量的函数
function session_file_register($key, $val) {
 
//设定session变量
$globals['_session'][$key] = $val;
 
//把该变量放到文件中
fseek($globals['fp'], 0, seek_end);
fwrite($globals['fp'], "$key=$valrn");
} //end of session_file_register()
//结束会话变量
function session_file_destroy() {
//1. 关闭文件指针
fclose($globals['fp']);
$fp = null;
//2. 设置session数组为空
$globals['_session'] = array();
} //end of session_file_destroy()


测试代码文件:1.php

代码如下:

//确定编码格式
header('content-type: text/html; charset=utf-8');
include("session-file.php");
//测试函数:
//开启会话
session_file_start();
//注册会话变量
$key = 'username';
$val = 'lsl';
session_file_register($key, $val);
session_file_register('username', 'lisa');
//打印session数组
echo $_session['username'];
?>
下一页


测试文件:2.php

代码如下:

//确定编码格式
header('content-type: text/html; charset=utf-8');
include("session-file.php");
//测试函数:
//开启会话
session_file_start();
echo $_session['username'];
?>

希望本文所述对大家的PHP程序设计有所帮助。

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