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This functions makes it easy to use session-variables known from ASP

This functions makes it easy to use session-variables known from ASP

<?php 
# ------------------------------------------------------------------- 
# 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 
# ------------------------------------------------------------------- 

   $sess_db = 'test'; 
   $sess_table = 'session'; 

# ---------------------------------------------------- 
# Session_CheckID - Get or Set the Session-ID 
# Parameter.: time how long the cookie will keept 
#             or null if it's only a session cookie 
# Return....: Session-Unique ID 
# ---------------------------------------------------- 
function Session_CheckID( $min ) 
{ 
   global $sess_sid; 

   if( !$sess_sid ) { 
      $sess_sid = uniqid( SC ); 
      if( $min > 0 ) { 
         SetCookie("sess_sid", $sess_sid, time()+($min*60), "/", "", 0 ); 
         } 
      else { 
         SetCookie("sess_sid", $sess_sid, "", "/", "", 0 ); 
         } 
      return( false ); 
      } 
   else { 
      return( $true ); 
      } 
} 

# ---------------------------------------------------------- 
# str2arr - build out from a string with eval the new array 
# parameter.: string 
# returns...: global array 
# ---------------------------------------------------------- 
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 - reads the session-variables 
# Parameter.: none 
# returns...: read - ok = true 
# ---------------------------------------------------------- 
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 - reads the session-array into a string 
# Parameter.: array 
# returns...: string with & separeted array fields 
# 
# Thanks to Rasmus 
# ------------------------------------------------------ 
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 - writes the session-variable from 
#                 the array session 
# parameter.: none 
# returns...: write - ok = true 
# --------------------------------------------------- 
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 - clears an entry 
# parameter.: hash - id 
# returns...: none 
# --------------------------------------------- 
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 = ''; 
} 

?> 

[------------------ This is an example ------------------] 

<?php 
   require( "session.inc" ); 

   if( $del ) { 
      session_del(); 
      } 

   session_checkid( 0 ); 

   mysql_connect('') or Die("can't connect to db!"); 

   # Normal use ist to read the session-var and assign it to the 
   # working vars. This example assign after session-read fail the 
   # new values. 
   if( session_read() ) { 
      $hallo = $session[hallo]; 
      $w12 = $session[w12]; 
      $arr = $session[arr]; 
      } 
   else { 
      for( $i = 1; $i <= 10; $i++ ) { 
         for( $j = 1; $j <= 2; $j++ ) { 
            $arr[$i][$j] = $i+$j; 
            } 
         } 

      $w12 = '10232'; 
      $hallo = 'Ho oh. '; 
      } 

?> 
<html> 
<head><title>Session/Cookie-Test 1</title> 
</head> 

<body> 

<h2>This Page should show how to handle the "session.inc" library</h2> 

<h3>We will use a mask with a record showing routine</h3> 

<?php 
   print "<h4>Show all variables</h4>"; 
   for( $i = 1; $i <= 10; $i++ ) { 
      print "\$arr: [$i][1-2] = " . $arr[$i][1] . " / " . $arr[$i][2] . "<br>"; 
      } 
   print "<br>"; 
   print "w12: " . $w12 . "<br>"; 
   print "hallo: " . $hallo . "<br>"; 

   # increment variables 
   for( $i = 1; $i <= 10; $i++ ) { 
      for( $j = 1; $j <= 2; $j++ ) { 
         $arr[$i][$j] += 2; 
         } 
      } 

   $w12++; 
   $hallo .= "w1"; 

   # ------------------------------------- 
   # reassign session variables 
   # ------------------------------------- 
   $session[arr] = $arr; 
   $session[w12] = $w12; 
   $session[hallo] = $hallo; 

   # ------------------------------------- 
   # store session variables 
   # ------------------------------------- 
   if( !session_write() ) { 
      print $sess_error; 
      } 

?> 

<form action=sess1.php3 method=post> 
<hr> 
   <input type=submit name=del value=" reset session "> 

If you like to reset the session - click 

</form> 

</body> 
</html>