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在PHP3中实现SESSION的功能
发表于：2007-07-14来源：作者：点击数：
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?php require(cookie.inc.php3) ; ? !DOCTYPE HTML PUBLIC -//W3C//D TD HTML 4.0 Transitional//EN html head titleUntitled/title /head body P在网页的任何地方设置cookie ?php if (!$show){ $username=liubing; jssetcookie(username,liubing,1); echo p
<?php require("cookie.inc.php3") ; ?><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<html>
<head>
<title>Untitled</title>
</head>
<body>
<P>在网页的任何地方设置cookie
<?php
if (!$show){
$username="liubing";
jssetcookie("username","liubing",1);
echo "<p>cookie username 被设置成 $username<br>";
echo "有效期1分钟<br>" ;
echo "<a href='$PATH_INFO?show=1'> 试一下cookiee 有没有起作用</a>" ;
}
else{
echo "<p>读到的cookie username 值为： $username<br>";
echo "有效期1分钟,1分钟后再刷新本页面就会看不到了<br>" ;
</a>" ;
}
?>
</body>
</html>
<?php
if (!isset($__session_inc__)){
$__session_inc__=1;
//require("cookie.inc.php3");
# -------------------------------------------------------------------
# Session Management v1.0 21.6.1998
# (c) Wild Karl Heinz <kh.wild@wicom.at>
#
# This Include handle Session based variable handling
#
# Please feel free and use it. If you make it more functional
# it would be nice to send me a copy.
#
# Don't forget - Mysql_connect !
#
# The database structure
# Table structure for table 'session'
#
# CREATE TABLE session (
# id int(11) DEFAULT '0' NOT NULL auto_increment,
# sid varchar(20) DEFAULT '' NOT NULL,
# val blob,
# times timestamp(14),
# PRIMARY KEY (id),
# KEY sid (sid),
# UNIQUE sid_2 (sid)
# );
#
# You'll miss here a cron job to delete the old sessions from db
# -------------------------------------------------------------------
// 请注意上面被注释掉的CREATE TABLE语句，
// 你需要在你所使用的数据库上执行这条语句，
// 表名也可以不是session，那么就需要设置下面的$sess_table变量了。
// 此处你需要设置库名，和表名。
// 不过一般建议就使用session作为表名
$sess_db = 'dbname';
$sess_table = 'session';
# ----------------------------------------------------
# Session_CheckID - 检查、设置并返回 Session-ID
# 参数......: cookie保存时间(以分钟计)
# 也可不设置表示这个 cookie 只在当前session 有效
# 这其实就象ASP中SESSION的时效一样。
# 返回值....: 一个唯一的Session-ID （作为cookie存储）
# ----------------------------------------------------
function Session_CheckID( $min )
{
global $sess_sid;
if( !$sess_sid ) {
$sess_sid = uniqid( SC ); //取得一个唯一的随机数
/*
if( $min > 0 ) {
SetCookie("sess_sid", $sess_sid, time()+($min*60), "/", "", 0 );
}
else {
SetCookie("sess_sid", $sess_sid, "", "/", "", 0 );
}
上面是原先的代码，会出错。所以另外用了一个更好的函数。
函数库：cookie.inc.php3
*/
jssetcookie("sess_sid",$sess_sid,$min);
return( false );
}
else {
return( true );
}
}
# ----------------------------------------------------------
# str2arr - 将字符串转换成session数组
# 参数.....: string
# 返回值...: 全局数组（其实就是session)
#本函数用途：将字符串转换成session数组
#如"session[username]=yourid&session[userpass]=12345"
#将会被转换成下面的数组
# session[username]="yourid"
# session[userpass]="12345"
#请注意函数split(),each(),list(),eval()的用法。
# ----------------------------------------------------------
function str2arr( $ts )
{
global $session;
$vals = split( "&", $ts );
while( list($key,$val) = each($vals) ) {
list( $name, $wert ) = split( "=", $val );
if( $val ) eval( "\$$name = \"$wert\";" );
}
}
# ----------------------------------------------------------
# session_read() - 从SESSION表中取数据，转换成session数组
# 参数........: 无
# 返回值......: 如果读出数据，返回 true ，否则返回 false
#注意.........: 用到了str2arr()这个函数
# ----------------------------------------------------------
function session_read()
{
# Hash array to keep session-variables
global $session;
global $sess_sid, $sess_db, $sess_table, $sess_error;
$sel = "Select val from $sess_table where sid = '$sess_sid'";
$res = mysql_db_query( $sess_db, $sel );
if( mysql_numrows( $res ) ) {
$val = mysql_result( $res, 0, "val" );
str2arr( $val );
mysql_free_result( $res );
return( true );
}
else {
return( false );
$sess_error = mysql_error();
}
}
# ------------------------------------------------------
# Split_Array() - 将session数组转换成字符串
# 参数.......: 数组
# 返回值.....: 数组转换得来的字符串
#
# Thanks to Rasmus (这人好象是PHP的发明人)
# 注意:将session数组转换成字符串
#如session[username]="yourid"
# session[userpass]="12345"
#将会被转换成"session[username]=yourid&session[userpass]=12345"
#同时该函数考虑到了数组的某个元素也是数据的情况
#这个函数被设计成一个递归函数
# ------------------------------------------------------
function Split_Array( $arr, $a = "", $b = "", $c = "" )
{
while( list( $key, $val ) = each( $arr ) ) {
if( is_array( $val ) ) {
$ts .= Split_Array( $arr[ $key ],
( strlen( $a ) ? $a : $key ),
( strlen( $b ) ? $b : ( strlen( $a ) ? $key : "" ) ),
( strlen( $c ) ? $c : ( strlen( $b ) ? $key : "" ) ) );
}
else {
$ts .= "session";
$ts .= $a ? "[$a]" : "";
$ts .= $b ? "[$b]" : "";
$ts .= $c ? "[$c]" : "";
$ts .= "[$key]=$val&";
}
}
return( $ts );
}
# ---------------------------------------------------
# session_write - 将session数组转换成字符串，再存到session表中
# 参数.: 无
# 返回值...: 如果存入正常返回 true ，否则返回 false
# ---------------------------------------------------
function session_write()
{
# Hash array to keep session-variables
global $session;
global $sess_sid, $sess_db, $sess_table;
global $sess_error;
# if you like to delete a session-cookie
# you must check it before writting the session
# array
if( !$sess_sid ) { session_checkid( 0 ); }
$ts = Split_Array( $session );
if( $ts > "" ) { $ts = substr( $ts, 0, strlen( $ts ) - 1 ); }
$res = mysql_db_query( $sess_db, "Select * from session where sid = '$sess_s'");
if( mysql_numrows( $res ) == 0 ) {
$sel = "Insert into $sess_table ( id, sid, val, times ) ";
$sel .= "values( 0, '$sess_sid', '$ts', NULL )";
}
else {
$sel = "Update $sess_table set val = '$ts', ";
$sel .= "times = NULL where sid = '$sess_sid'";
}
if( !mysql_db_query( $sess_db, $sel ) ) {
$sess_error = mysql_error();
return( false );
}
else { return( true ); }
}
# ---------------------------------------------
# session_del - 清除当前所有的session
# 并删除session表中和当前session有关的记录
# 参数.....: 一个随机的session id
# 返回值...: 无
# ---------------------------------------------
function session_del()
{
global $session, $sess_db, $sess_table, $sess_sid;
$sel = "Delete from $sess_table where sid = '$sess_sid'";
if( !mysql_db_query( $sess_db, $sel ) ) {
$sess_error = mysql_error();
}
$sess_sid = '';
}
}
?>
<?php
if (!isset($__cookie_inc__)){
$__cookie_inc__=1;
function JsSetCookie($CName,$CValue,$CExpr=FALSE){
// 这个函数允许你在HTML头标记之后设置cookie ,
// 可以作SetCookie函数的补充，甚至代替。
// $CName.....: cookie 的名字
// $CValue....: cookie 的值
// $CEXpr.....: cookie 的有效期，以分钟为单位，也可以修改加入小时，天数
if($CExpr > 0){
$CookieString="astr= '$CName' + '=' + '$CValue' + ';expires=' + expr + ';path=/';";
$Cookie.="\n<script language=\"javascript\">\n";
$Cookie.='function makeYearExpDate(min){
var expire = new Date();
expire.setTime(expire.getTime() + ((min * 60) * 1000));
expire = expire.toGMTString()
return expire
}
expr =makeYearExpDate('.$CExpr.');';
$Cookie.="\n".$CookieString."\n";
$Cookie.="document.cookie=astr;\n</script>\n";
}else{
$Cookie.="\n<script language=\"javascript\">\n";
$Cookie.="document.cookie='$CName=$CValue;path=/';";
$Cookie.="\n</script>\n";
}
echo $Cookie;
}
}
?>
<?php require( "session.inc.php3");
require("cookie.inc.php3");
?>
<?php
session_checkid( 20 ); //20分钟后session失效
//下面你需要设置mysql的连接参数
mysql_connect('localhost','user','pass') or Die("can't connect to db!");
?>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN">
<html>
<head>
<title>Session/Cookie-测试</title>
</head>
<body>
<h2>This Page should show how to handle the "session.inc.php3" library</h2>
<h3>We will use a mask with a record showing routine</h3>
<?php
if( $show ) {
if( session_read() ) {
$username = $session[username];
$userpass = $session[userpass];
echo "<P>session[username]:$username<br>session[userpass]:$userpass";
}
}
else{
$session[username]="yourid";
$session[userpass]="12345";
if( !session_write() ) {
print $sess_error;
}else{
echo "<p>session[username]被设置成：$session[username]<br>" ;
echo "session[userpass]被设置成：$session[userpass]<br>" ;
echo "<a href='$PATH_INFO?show=1'>测试一下SESSION的作用</a>" ;
}
}
?>
</body>
</html>
