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在PHP3中實現SESSION的功能
發表于：2007-07-14來源：作者：點擊數：
標簽：
?php require(cookie.inc.php3) ; ? !DOCTYPE HTML PUBLIC -//W3C//D TD HTML 4.0 Transitional//EN html head titleUntitled/title /head body P在網頁的任何地方設置cookie ?php if (!$show){ $username=liubing; jssetcookie(username,liubing,1); echo p
<?php require("cookie.inc.php3") ; ?><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<html>
<head>
<title>Untitled</title>
</head>
<body>
<P>在網頁的任何地方設置cookie
<?php
if (!$show){
$username="liubing";
jssetcookie("username","liubing",1);
echo "<p>cookie username 被設置成 $username<br>";
echo "有效期1分鐘<br>" ;
echo "<a href='$PATH_INFO?show=1'> 試一下cookiee 有沒有起作用</a>" ;
}
else{
echo "<p>讀到的cookie username 值為： $username<br>";
echo "有效期1分鐘,1分鐘后再刷新本頁面就會看不到了<br>" ;
</a>" ;
}
?>
</body>
</html>
<?php
if (!isset($__session_inc__)){
$__session_inc__=1;
//require("cookie.inc.php3");
# -------------------------------------------------------------------
# Session Management v1.0 21.6.1998
# (c) Wild Karl Heinz <kh.wild@wicom.at>
#
# This Include handle Session based variable handling
#
# Please feel free and use it. If you make it more functional
# it would be nice to send me a copy.
#
# Don't forget - Mysql_connect !
#
# The database structure
# Table structure for table 'session'
#
# CREATE TABLE session (
# id int(11) DEFAULT '0' NOT NULL auto_increment,
# sid varchar(20) DEFAULT '' NOT NULL,
# val blob,
# times timestamp(14),
# PRIMARY KEY (id),
# KEY sid (sid),
# UNIQUE sid_2 (sid)
# );
#
# You'll miss here a cron job to delete the old sessions from db
# -------------------------------------------------------------------
// 請注意上面被注釋掉的CREATE TABLE語句，
// 你需要在你所使用的數據庫上執行這條語句，
// 表名也可以不是session，那么就需要設置下面的$sess_table變量了。
// 此處你需要設置庫名，和表名。
// 不過一般建議就使用session作為表名
$sess_db = 'dbname';
$sess_table = 'session';
# ----------------------------------------------------
# Session_CheckID - 檢查、設置并返回 Session-ID
# 參數......: cookie保存時間(以分鐘計)
# 也可不設置表示這個 cookie 只在當前session 有效
# 這其實就象ASP中SESSION的時效一樣。
# 返回值....: 一個唯一的Session-ID （作為cookie存儲）
# ----------------------------------------------------
function Session_CheckID( $min )
{
global $sess_sid;
if( !$sess_sid ) {
$sess_sid = uniqid( SC ); //取得一個唯一的隨機數
/*
if( $min > 0 ) {
SetCookie("sess_sid", $sess_sid, time()+($min*60), "/", "", 0 );
}
else {
SetCookie("sess_sid", $sess_sid, "", "/", "", 0 );
}
上面是原先的代碼，會出錯。所以另外用了一個更好的函數。
函數庫：cookie.inc.php3
*/
jssetcookie("sess_sid",$sess_sid,$min);
return( false );
}
else {
return( true );
}
}
# ----------------------------------------------------------
# str2arr - 將字符串轉換成session數組
# 參數.....: string
# 返回值...: 全局數組（其實就是session)
#本函數用途：將字符串轉換成session數組
#如"session[username]=yourid&session[userpass]=12345"
#將會被轉換成下面的數組
# session[username]="yourid"
# session[userpass]="12345"
#請注意函數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() - 從SESSION表中取數據，轉換成session數組
# 參數........: 無
# 返回值......: 如果讀出數據，返回 true ，否則返回 false
#注意.........: 用到了str2arr()這個函數
# ----------------------------------------------------------
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() - 將session數組轉換成字符串
# 參數.......: 數組
# 返回值.....: 數組轉換得來的字符串
#
# Thanks to Rasmus (這人好象是PHP的發明人)
# 注意:將session數組轉換成字符串
#如session[username]="yourid"
# session[userpass]="12345"
#將會被轉換成"session[username]=yourid&session[userpass]=12345"
#同時該函數考慮到了數組的某個元素也是數據的情況
#這個函數被設計成一個遞歸函數
# ------------------------------------------------------
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 - 將session數組轉換成字符串，再存到session表中
# 參數.: 無
# 返回值...: 如果存入正常返回 true ，否則返回 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 - 清除當前所有的session
# 并刪除session表中和當前session有關的記錄
# 參數.....: 一個隨機的session id
# 返回值...: 無
# ---------------------------------------------
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){
// 這個函數允許你在HTML頭標記之后設置cookie ,
// 可以作SetCookie函數的補充，甚至代替。
// $CName.....: cookie 的名字
// $CValue....: cookie 的值
// $CEXpr.....: cookie 的有效期，以分鐘為單位，也可以修改加入小時，天數
if($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分鐘后session失效
//下面你需要設置mysql的連接參數
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-測試</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 $sess_error;
}else{
echo "<p>session[username]被設置成：$session[username]<br>" ;
echo "session[userpass]被設置成：$session[userpass]<br>" ;
echo "<a href='$PATH_INFO?show=1'>測試一下SESSION的作用</a>" ;
}
}
?>
</body>
</html>
原文轉自：http://www.anti-gravitydesign.com
