<?php
/********************************
OSBib:
A collection of PHP classes to create and manage bibliographic formatting for OS bibliography software 
using the OSBib standard.

Released through http://bibliophile.sourceforge.net under the GPL licence.
Do whatever you like with this -- some credit to the author(s) would be appreciated.

If you make improvements, please consider contacting the administrators at bibliophile.sourceforge.net 
so that your improvements can be added to the release package.

Adapted from WIKINDX: http://wikindx.sourceforge.net

Mark Grimshaw 2005
http://bibliophile.sourceforge.net
********************************/
/**
*	Session functions
*
*	@author Mark Grimshaw
*
*	$Header: /cvsroot/bibliophile/OSBib/create/SESSION.php,v 1.1 2005/06/20 22:26:51 sirfragalot Exp $
*/
class SESSION
{
// Constructor
	function SESSION()
	{
		if(isset($_SESSION))
			$this->sessionVars = &$_SESSION;
	}
// Set a session variable
	function setVar($key, $value)
	{
		if(!isset($key) || !isset($value)) return false;
		$this->sessionVars[$key] = $value;
		if(!isset($this->sessionVars[$key]))
		{
			return false;
		}
		return true;
	}
// Get a session variable
	function getVar($key)
	{
		if(isset($this->sessionVars[$key]))
			return $this->sessionVars[$key];
		return false;
	}
// Delete a session variable
	function delVar($key)
	{
		if(isset($this->sessionVars[$key]))
			unset($this->sessionVars[$key]);
	}
// Is a session variable set?
	function issetVar($key)
	{
		if(isset($this->sessionVars[$key])) return true;
		return false;
	}
// Destroy the whole session
	function destroy()
	{
		$this->sessionVars = array();
	}
// Return an associative array of all session variables starting with $prefix_.
// key in returned array is minus the prefix to aid in matching database table fields.
	function getArray($prefix)
	{
		$prefix .= '_';
		foreach($this->sessionVars as $key => $value)
		{
			if(preg_match("/^$prefix(.*)/", $key, $matches))
				$array[$matches[1]] = $value;
		}
		if(isset($array))
			return $array;
		return FALSE;
	}
// Write to session variables named with $prefix_ the given associative array
	function writeArray($row, $prefix = FALSE)
	{
		foreach($row as $key => $value)
		{
			if(!$value)
				$value = FALSE;
			if($prefix)
			{
				if(!$this->setVar($prefix . '_' . $key, $value))
					return FALSE;
			}
			else
			{
				if(!$this->setVar($key, $value))
					return FALSE;
			}
		}
		return TRUE;
	}
// Clear session variables named with $prefix
	function clearArray($prefix)
	{
		$prefix .= '_';
		foreach($this->sessionVars as $key => $value)
		{
			if(preg_match("/^$prefix/", $key))
				$this->delVar($key);
		}
	}
}
?>