Mega Code Archive
This functions makes it easy to use session-variables known from ASP
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With one Cookie the array session will save and restore from a db-record
<?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
#
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>
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