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<?php
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/*
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$Id: navigation_history.php 203 2005-09-23 14:17:59Z hpdl $
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osCommerce, Open Source E-Commerce Solutions
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http://www.oscommerce.com
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Copyright (c) 2005 osCommerce
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Released under the GNU General Public License
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*/
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class osC_NavigationHistory {
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/* Private variables */
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var $_data = array(),
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$_snapshot = array();
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/* Class constructor */
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function osC_NavigationHistory($add_current_page = false) {
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if (isset($_SESSION['osC_NavigationHistory_data']) && is_array($_SESSION['osC_NavigationHistory_data']) && (empty($_SESSION['osC_NavigationHistory_data']) === false)) {
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$this->_data =& $_SESSION['osC_NavigationHistory_data'];
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}
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if (isset($_SESSION['osC_NavigationHistory_snapshot']) && is_array($_SESSION['osC_NavigationHistory_snapshot']) && (empty($_SESSION['osC_NavigationHistory_snapshot']) === false)) {
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$this->_snapshot =& $_SESSION['osC_NavigationHistory_snapshot'];
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}
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if ($add_current_page === true) {
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$this->addCurrentPage();
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}
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}
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/* Public methods */
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function addCurrentPage() {
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global $request_type, $cPath;
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$set = 'true';
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for ($i=0, $n=sizeof($this->_data); $i<$n; $i++) {
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if ($this->_data[$i]['page'] == basename($_SERVER['PHP_SELF'])) {
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if (isset($cPath)) {
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if (!isset($this->_data[$i]['get']['cPath'])) {
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continue;
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} else {
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if ($this->_data[$i]['get']['cPath'] == $cPath) {
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array_splice($this->_data, ($i+1));
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$set = 'false';
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break;
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} else {
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$old_cPath = explode('_', $this->_data[$i]['get']['cPath']);
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$new_cPath = explode('_', $cPath);
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for ($j=0, $n2=sizeof($old_cPath); $j<$n2; $j++) {
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if ($old_cPath[$j] != $new_cPath[$j]) {
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array_splice($this->_data, ($i));
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$set = 'true';
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break 2;
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}
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}
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}
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}
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} else {
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array_splice($this->_data, $i);
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$set = 'true';
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break;
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}
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}
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}
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if ($set == 'true') {
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$this->_data[] = array('page' => basename($_SERVER['PHP_SELF']),
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'mode' => $request_type,
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'get' => $_GET,
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'post' => $_POST);
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if (isset($_SESSION['osC_NavigationHistory_data']) === false) {
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$_SESSION['osC_NavigationHistory_data'] = $this->_data;
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}
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}
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}
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function removeCurrentPage() {
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$last_entry_position = sizeof($this->_data) - 1;
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if ($this->_data[$last_entry_position]['page'] == basename($_SERVER['PHP_SELF'])) {
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unset($this->_data[$last_entry_position]);
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if (sizeof($this->_data) > 0) {
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if (isset($_SESSION['osC_NavigationHistory_data']) === false) {
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$_SESSION['osC_NavigationHistory_data'] = $this->_data;
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}
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} else {
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$this->resetPath();
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}
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}
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}
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function hasPath($back = 1) {
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if ( (is_numeric($back) === false) || (is_numeric($back) && ($back < 1)) ) {
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$back = 1;
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}
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return isset($this->_data[sizeof($this->_data) - $back]);
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}
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function getPathURL($back = 1, $exclude = array()) {
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if ( (is_numeric($back) === false) || (is_numeric($back) && ($back < 1)) ) {
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$back = 1;
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}
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$back = sizeof($this->_data) - $back;
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return tep_href_link($this->_data[$back]['page'], $this->_parseParameters($this->_data[$back]['get'], $exclude), $this->_data[$back]['mode']);
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}
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function setSnapshot($page = '') {
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global $request_type;
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if (is_array($page)) {
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$this->_snapshot = array('page' => $page['page'],
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'mode' => $page['mode'],
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'get' => $page['get'],
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'post' => $page['post']);
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} else {
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$this->_snapshot = array('page' => basename($_SERVER['PHP_SELF']),
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'mode' => $request_type,
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'get' => $_GET,
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'post' => $_POST);
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}
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if (isset($_SESSION['osC_NavigationHistory_snapshot']) === false) {
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$_SESSION['osC_NavigationHistory_snapshot'] = $this->_snapshot;
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}
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}
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function hasSnapshot() {
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return !empty($this->_snapshot);
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}
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function getSnapshot($key) {
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if (isset($this->_snapshot[$key])) {
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return $this->_snapshot[$key];
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}
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}
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function getSnapshotURL($auto_mode = false) {
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if ($this->hasSnapshot()) {
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$target = tep_href_link($this->_snapshot['page'], $this->_parseParameters($this->_snapshot['get']), ($auto_mode === true) ? 'AUTO' : $this->_snapshot['mode']);
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} else {
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$target = tep_href_link(FILENAME_DEFAULT, '', ($auto_mode === true) ? 'AUTO' : $this->_snapshot['mode']);
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}
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return $target;
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}
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function redirectToSnapshot() {
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$target = $this->getSnapshotURL(true);
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$this->resetSnapshot();
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tep_redirect($target);
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}
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function resetPath() {
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$this->_data = array();
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if (isset($_SESSION['osC_NavigationHistory_data'])) {
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unset($_SESSION['osC_NavigationHistory_data']);
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}
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}
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function resetSnapshot() {
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$this->_snapshot = array();
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if (isset($_SESSION['osC_NavigationHistory_snapshot'])) {
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unset($_SESSION['osC_NavigationHistory_snapshot']);
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}
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}
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function reset() {
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$this->resetPath();
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$this->resetSnapshot();
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}
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function _parseParameters($array, $additional_exclude = array()) {
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global $osC_Session;
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$exclude = array('x', 'y', $osC_Session->getName());
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if (is_array($additional_exclude) && (empty($additional_exclude) === false)) {
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$exclude = array_merge($exclude, $additional_exclude);
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}
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$string = '';
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if (is_array($array) && (empty($array) === false)) {
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foreach ($array as $key => $value) {
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if (in_array($key, $exclude) === false) {
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$string .= $key . '=' . $value . '&';
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}
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}
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$string = substr($string, 0, -1);
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}
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return $string;
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}
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}
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?>
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