una/studio/classes/BxDolStudioCart.php

<?php defined('BX_DOL') or die('hack attempt');
/**
 * Copyright (c) BoonEx Pty Limited - http://www.boonex.com/
 * CC-BY License - http://creativecommons.org/licenses/by/3.0/
 *
 * @defgroup    DolphinStudio Dolphin Studio
 * @{
 */

class BxDolStudioCart extends BxDol implements iBxDolSingleton {
	public static $sIDiv = ':';
	public static $sPDiv = '_';
	private $sSessionKey = 'bx-std-str-cart';
	private $bAllowAccumulate = false;

    public function __construct() {
    	if (isset($GLOBALS['bxDolClasses'][get_class($this)]))
            trigger_error ('Multiple instances are not allowed for the class: ' . get_class($this), E_USER_ERROR);

        parent::__construct ();
    }

	public function __clone() {
        if (isset($GLOBALS['bxDolClasses'][get_class($this)]))
            trigger_error('Clone is not allowed for the class: ' . get_class($this), E_USER_ERROR);
    }

	public static function getInstance() {
        if (!isset($GLOBALS['bxDolClasses'][__CLASS__])) {
        	$sClass = __CLASS__;
            $GLOBALS['bxDolClasses'][__CLASS__] = new $sClass();
        }

        return $GLOBALS['bxDolClasses'][__CLASS__];
    }

	/**
     * Conver items to array with necessary structure.
     *
     * @param string/array $mixed - string with cart items divided with (:) or an array of cart items.
     * @return array with items.
     */
    public static function items2array($mixed) {
        $aResult = array();
        if(empty($mixed))
        	return $aResult;

		$sClass = __CLASS__;
        if(is_string($mixed))
			$aItems = explode($sClass::$sIDiv, $mixed);
        else if(is_array($mixed))
			$aItems = $mixed;
        else
            $aItems = array();

        foreach($aItems as $sItem) {
            $aItem = explode($sClass::$sPDiv, $sItem);
            $aResult[] = array('vendor' => $aItem[0], 'item_id' => $aItem[1], 'item_count' => $aItem[2]);
        }

        return $aResult;
    }

    public function add($sVendor, $iItemId, $iItemCount) {
    	$sDiv = BxDolStudioCart::$sPDiv;
    	$oSession = BxDolSession::getInstance();

        $sCartItem = $sVendor . $sDiv . $iItemId . $sDiv . $iItemCount;
        $sCartItems = $this->getItems();

        if(strpos($sCartItems, $sVendor . $sDiv . $iItemId . $sDiv) !== false) {
        	if($this->bAllowAccumulate)
            	$sCartItems = preg_replace("'" . $sVendor . $sDiv . $iItemId . $sDiv . "([0-9])+'e", "'" . $sVendor . $sDiv . $iItemId . $sDiv ."' . (\\1 + " . $iItemCount . ")",  $sCartItems);
        }
        else
            $sCartItems = empty($sCartItems) ? $sCartItem : $sCartItems . BxDolStudioCart::$sIDiv . $sCartItem;

		$this->setItems($sCartItems);
    }

    public function delete($sVendor, $iItemId = 0) {
		$sPattern = "'" . $sVendor . (!empty($iItemId) ? "_" . $iItemId : "_[0-9]+") . "_[0-9]+:?'";

        $sCartItems = $this->getItems();
        $sCartItems = trim(preg_replace($sPattern, "", $sCartItems), BxDolStudioCart::$sIDiv);
        $this->setItems($sCartItems);
    }

	public function getCount($sVendor = '') {
		if($sVendor == '') {
			$sItems = $this->getItems();
			$aItems = $this->items2array($sItems);
			return count($aItems);
		}

    	$aVendors = $this->parseByVendor();
    	if(!isset($aVendors[$sVendor]))
    		return 0;

    	return count($aVendors[$sVendor]);
    }

    public function getByVendor($sVendor) {
    	$aVendors = $this->parseByVendor();
    	if(!isset($aVendors[$sVendor]) || empty($aVendors[$sVendor]))
    		return array();

    	return $aVendors[$sVendor];
    }

    public function parseByVendor(){
        $sItems = $this->getItems();
        return $this->parseBy($this->items2array($sItems), 'vendor');
    }

    protected function getItems() {
    	$oSession = BxDolSession::getInstance();
        return $oSession->getValue($this->sSessionKey);
    }

    protected function setItems($sItems) {
    	$oSession = BxDolSession::getInstance();
    	$oSession->setValue($this->sSessionKey, $sItems);
    }

    protected function parseBy($aItems, $sKey) {
        $aResult = array();
        foreach($aItems as $aItem)
            if(isset($aItem[$sKey]))
                $aResult[$aItem[$sKey]][] = $aItem;

        return $aResult;
    }
}

/** @} */