<?php
//定義一個(gè)超全局?jǐn)?shù)組
$_session = array();
//定義文件句柄
$fp = null;
 
//用戶自定義的開(kāi)啟session函數(shù)
function session_file_start() {
 
//1. 首先判斷瀏覽器有沒(méi)有發(fā)送cookie值
if (isset($_cookie['fileid'])) {
 
//2. 接收cookie值
$filename = $_cookie['fileid'];
 
//3. 打開(kāi)文件，用于讀寫
if (file_exists($filename)) {
$globals['fp'] = fopen($filename, 'r+');
} else {
$globals['fp'] = fopen($filename, 'w+');
}
} else {
//2. 設(shè)置一個(gè)文件，并把該文件名放到cookie中
$filename = date('ymdhis');
setcookie('fileid', $filename, time()+60*60*24);
 
//3. 打開(kāi)文件，用于讀寫
$globals['fp'] = fopen($filename, 'w+');
 
} //end of if-else
 
//4. 把文件中的數(shù)據(jù)存儲(chǔ)到超全局?jǐn)?shù)組$_session中
while (!feof($globals['fp'])) {
//讀取文件中的一行
$buffer = fgets($globals['fp']);
//處理所讀取的這一行
$tmparr = explode('=', trim($buffer, 'rn'));
 
//添加到session數(shù)組中
if (count($tmparr) == 2) {
$globals['_session'][$tmparr[0]] = $tmparr[1];
}
} //end of while
 
} //end of session_file_start()
 
//注冊(cè)會(huì)話變量的函數(shù)
function session_file_register($key, $val) {
 
//設(shè)定session變量
$globals['_session'][$key] = $val;
 
//把該變量放到文件中
fseek($globals['fp'], 0, seek_end);
fwrite($globals['fp'], "$key=$valrn");
} //end of session_file_register()
//結(jié)束會(huì)話變量
function session_file_destroy() {
//1. 關(guān)閉文件指針
fclose($globals['fp']);
$fp = null;
//2. 設(shè)置session數(shù)組為空
$globals['_session'] = array();
} //end of session_file_destroy()

<?php
//確定編碼格式
header('content-type: text/html; charset=utf-8');
include("session-file.php");
//測(cè)試函數(shù)：
//開(kāi)啟會(huì)話
session_file_start();
//注冊(cè)會(huì)話變量
$key = 'username';
$val = 'lsl';
session_file_register($key, $val);
session_file_register('username', 'lisa');
//打印session數(shù)組
echo $_session['username'];
?>
<a href="2.php">下一頁(yè)</a>

<?php
//確定編碼格式
header('content-type: text/html; charset=utf-8');
include("session-file.php");
//測(cè)試函數(shù)：
//開(kāi)啟會(huì)話
session_file_start();
echo $_session['username'];
?>