SESSION函数库：session.inc.php3 <?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 = ""; } } ?> 原作者：不详
