view, * * 'order' => array( * 'fields' => array( * 0 => array( * 'field_name' => field_name, * 'field_alias' => field_alias, * 'handler' => handler, * ), * .. * ), * 'visible' => TRUE/FALSE, * ), * * 'hierarchy' => array( * 'field' => array( * 'field_name' => field_name, * 'field_alias' => field_alias, * 'handler' => handler, * ), * 'visible' => TRUE/FALSE, * ), * * 'types' = array( * node_type1 => "root"/"leaf", * node_type2 => "root"/"leaf", * .. * ), * * 'expand_links' = array( * 'show' => TRUE/FALSE, * 'default_collapsed' => TRUE/FALSE, * 'by_uid' => TRUE/FALSE, * ), * * 'view_window_extensions' = array( * 'extension_top' => 3, * 'extension_bottom' => 3, * ), * * 'locked' => TRUE/FALSE, * * 'nodes' => array( * nid1 => array( * 'order' => array( * 0 => value, * 1 => value, * .. * ), * 'parent' => value, * ), * .. * ), * ); */ function _draggableviews_info($view, $info = NULL) { $options = $view->style_plugin->options; $fields = $view->field; $results = $view->result; // if there is already an info array just rebuild the nodes array and skip this section if (!isset($info)) { $info = array(); // extract draggableviews settings. if (isset($options['tabledrag_order'])) { foreach ($options['tabledrag_order'] as $field) { if ($handler = _draggableviews_init_handler($field, $view)) { $info['order']['fields'][] = array( 'handler' => $handler, 'field_name' => $field['field'], 'field_alias' => $fields[$field['field']]->field_alias, ); } else { drupal_set_message(t('Draggableviews: Handler ') . $field['handler'] . t(' could not be found.'), 'error'); unset($info['order']); return $info; } } $info['order']['visible'] = strcmp($options['tabledrag_order_visible']['visible'], 'visible') == 0 ? TRUE : FALSE; if (count($info['order']['fields']) >= 2 && $options['tabledrag_hierarchy']['field'] != 'none') { if ($handler = _draggableviews_init_handler($options['tabledrag_hierarchy'], $view)) { $info['hierarchy'] = array( 'field' => array( 'handler' => $handler, 'field_name' => $options['tabledrag_hierarchy']['field'], 'field_alias' => $fields[$options['tabledrag_hierarchy']['field']]->field_alias, ), 'visible' => strcmp($options['tabledrag_hierarchy_visible']['visible'], 'visible') == 0 ? TRUE : FALSE, ); if (isset($options['tabledrag_types'])) { foreach ($options['tabledrag_types'] as $type) { $info['types'][$type['node_type']] = $type['type']; } } $info['expand_links'] = array( 'show' => strcmp($options['tabledrag_expand']['expand_links'], 'expand_links') == 0 ? TRUE : FALSE, 'default_collapsed' => strcmp($options['tabledrag_expand']['collapsed'], 'collapsed') == 0 ? TRUE : FALSE, 'by_uid' => strcmp($options['tabledrag_expand']['by_uid'], 'by_uid') == 0 ? TRUE : FALSE, ); } else { drupal_set_message(t('Draggableviews: Handler ') . $field['handler'] . t(' could not be found.'), 'error'); } } $info['view_window_extensions'] = $options['draggableviews_extensions']; if (!isset($info['view_window_extensions']['extension_top'])) $info['view_window_extensions']['extension_top'] = 3; if (!isset($info['view_window_extensions']['extension_bottom'])) $info['view_window_extensions']['extension_bottom'] = 3; $info['locked'] = strcmp($options['tabledrag_lock']['lock'], 'lock') == 0 ? TRUE : FALSE; } } // Hold a reference of the view object itself. $info['view'] = &$view; // Get all nodes and their properties. $info['nodes'] = array(); if (isset($info['order'])) { // loop through all resulting nodes foreach ($results as $row) { foreach ($info['order']['fields'] as $field) { if (is_numeric($row->{$field['field_alias']})) { $info['nodes'][$row->nid]['order'][] = (int)($row->{$field['field_alias']}); } else { // Default position of new nodes. $info['nodes'][$row->nid]['order'][] = variable_get('draggableviews_default_on_top', 1) == 1 ? -1 : 99999; } } if (isset($info['hierarchy'])) { $info['nodes'][$row->nid]['parent'] = (int)($row->{$info['hierarchy']['field']['field_alias']}); } } } return $info; } /* * Quick Check Structure * * I used the word "Quick" because only visible nodes and only the very top hierarchy level will be checked. If the * return is TRUE we can be sure that the structure will be displayed correctly. But errors that don't affect the * current output can not be detected. Enhanced checks will be done when we have to rebuild a broken structure. * * We check for the following: * - Wrong order values: The order values must constantly increase by 1, independent of the hierarchy level. * - Parent mismatch: The parent_nid must equal with the nid we memorized before we entered the current hierarchy level. * * @param $inputs * The structured info array. Look at _draggableviews_info(..) to learn more. * * return * TRUE if structure is valid */ function _draggableviews_quick_check_structure($info) { // Calculate views page offset. $pager = $info['view']->pager; $offset = $pager['items_per_page'] * $pager['current_page'] + $pager['offset']; // Call function in checking mode (renumber = FALSE). The order value must begin with $offset. return _draggableviews_ascending_numbers($info, $offset, FALSE); } /** * Build hierarchy * * Although there shouldn't be any structure based errors after submit * broken parents can be detected and repaired. All other structure based errors * can not be detected. If there are any they will be detected by _draggableviews_quick_check_structure(..) * and finally repaired by _draggableviews_analyze_structure(..). * * @param $info * The structured information array */ function _draggableviews_build_hierarchy(&$info) { $nodes = &$info['nodes']; $input = &$info['input']; foreach ($nodes as $nid => $prop) { // get depth if (($depth = _draggableviews_get_hierarchy_depth($nid, $input, $info)) === FALSE) { // Error! The hierarchy structure is broken and could // look like the following: (we're currently processing X) // A // --X // --D // // The next steps: // 1) bring it down to the root level // 2) Set order fields to the minimum $input[$nid]['parent'] = 0; // We gracefully sidestep the order-loop $depth = -1; } // Let's take a look at the following expample, to understand // what is beeing done. // // A // --B // --C // --X // --D // E // Imagine we're currently processing X: // // We know that X is in depth=3, so we save the received // weight value in the 3rd order field of node X. // // The 2nd order field must inherit the received weight of // node C (the next parent). And the 1st order field must // inherit the received weight of node A (the parent of C). // // When we finally order the view by weight1, weight2, weight3 then // weight1 and weight2 from node X will always equal with // those from node A and B, and weight3 defines the order of the 3rd level. $temp_nid = $nid; for ($i = $depth; $i >= 0; $i--) { // we're operating top-down, so we determine the parents nid by the way $nodes[$nid]['order'][$i] = $input[$temp_nid]['order'][0]; if (isset($info['hierarchy']) && $i > 0) { if (!($temp_nid = $input[$temp_nid]['parent'])) { // this line should never be reached assumed the depth // was calculated correctly. drupal_set_message(t('Undefined State called in draggableviews_build_hierarchy(..)'), 'error'); break; } } } if (isset($info['hierarchy'])) { // Simply set the parent value $nodes[$nid]['parent'] = $input[$nid]['parent']; } // Now set all unused weights to a minimum value. Otherwise // it could happen that a child appears above its parent. // The ? can be anything, unfortunately also > 5 // // --A (3,5) // B (3,?) // // To guaranteer that the ? is always the lowest, we choose // the minimum. $depth = ($depth == -1) ? 0 : $depth; for ($i = $depth + 1; $i < count($info['order']['fields']); $i++) { $nodes[$nid]['order'][$i] = $info['order']['fields'][$i]['handler']->get_minimum_value(); $nodes[$nid]['depth'] = $depth; } } // Last but not least sort nodes and assign ascending numbers. This is necessary since this module supports paging. _draggableviews_sort_nodes($nodes); // calculate views page offset $pager = $info['view']->pager; $offset = $pager['items_per_page'] * $pager['current_page'] + $pager['offset']; _draggableviews_ascending_numbers($info, $offset, TRUE); } /** * Rebuild hierarchy * * This function is called when the structure is broken. * * @param $info * The structured information array. Look at _draggableviews_info(..) to learn more. */ function _draggableviews_rebuild_hierarchy(&$info) { // We backup the page settings and restore them after completing all operations. $backup_pager = $info['view']->pager; if ($backup_pager['items_per_page'] > 0) { // We have to make sure that there's no hidden node with an order value that refers to the current page. // If the items to display per page are limitated we load the entire view. //@todo: We reduce the fields to a minimum because of performance issues. _draggableviews_reload_info($info, 0, 0, 0); } // Calculate depth values. // Nodes with broken parents will be brought down to the root level. // These depth values will be used for both theming and repairing broken structures. _draggableviews_calculate_depths($info); // Detect and repair ordering errors. // The nodes order values have to equal with the parents order values. _draggableviews_check_order($info); // The last issue we have to deal with is the order itself. Probably there // are more many with the same order value what could lead to display errors. // We just sort the nodes by their current order values and subsequent we assign ascending numbers. _draggableviews_sort_nodes($info['nodes']); _draggableviews_ascending_numbers($info, 0, TRUE); // Save hierarchy. _draggableviews_save_hierarchy($info); // The structure should be valid now. // Nonetheless let's make a final check for debugging reasons. if (!_draggableviews_quick_check_structure($info)) { drupal_set_message("Draggableviews: Rebuilding structure didn't work. The structure is broken.", "error"); } // Re-execute view with original page settings. _draggableviews_reload_info($info, $backup_pager['items_per_page'], $backup_pager['current_page'], $backup_pager['offset']); } /** * (CHECK/WRITE) Ascending Numbers. * * This function is used for both renumbering and checking. * Order values have to start with $offset. * * @param $info * The structured info array. Look at _draggableviews_info(..) to learn more. * @param $offset * Where we start to count. * @param $renumber * Renumber or check. * * @return * TRUE if no errors found. */ function _draggableviews_ascending_numbers(&$info, $offset = 0, $renumber = FALSE) { // We need to hold // 1) the last nid, // 2) the last order value of each hierarchy level, // 3) the parent's nid of each hierarchy level, // 3a) the current depth (hierarchy level), $last_nid = -1; $last_order = array($offset); $last_parent_nid = array(0); $depth = 0; foreach ($info['nodes'] as $nid => $values) { $parent_nid = isset($info['hierarchy']) ? $values['parent'] : 0; // Let's take a look at the following expample, to understand what is beeing done. // The order value of the parent's level always equals with the parent's value. // // A (0 - -) First node of level0. // --B (0 1 -) First node of level1. But we continue counting. // --C (0 1 2) First node of level2. But we still continue counting. // X (3 - -) Now we leave 2 levels (level2->level0). We still have to continue counting. // // Imagine we are currently processing X. We are leaving 2 levels and we need to determine the // last order value that was used. First we check how many levels are beeing left: $leave_hierarchy_levels = 0; for ($i = 0; $i < $depth; $i++) { if ($parent_nid == $last_parent_nid[$i]) { // Found the level we go to. Calculate the number of levels that are beeing left. $leave_hierarchy_levels = $depth - $i; break; } } if ($leave_hierarchy_levels > 0) { // We leave some hierarchy levels. We simply inherit the order value of the level we come from. $depth -= $leave_hierarchy_levels; $last_order[$depth] = $last_order[$depth + $leave_hierarchy_levels]; // Remove obsoleted values from stack. for ($i = 0; $i < $leave_hierarchy_levels; $i++) { array_pop($last_parent_nid); array_pop($last_order); } } else if ($parent_nid == $last_nid) { // We are entering a new level. This is the first child of the last node. array_push($last_parent_nid, $last_nid); array_push($last_order, $last_order[$depth]); // Hold the previous order value of the last level. $last_order[$depth]--; $depth++; } else if ($parent_nid != $last_parent_nid[$depth]) { // This node is neither a member of any previous hierarchy level // nor a child of the last node (opening a new level) // nor a member of the current hierarchy level // There's something wrong! if ($renumber) { drupal_set_message("Something wrong in _draggableviews_ascending_numbers (". ($renumber ? 'WRITE' : 'CHECK') .").", "error"); } return FALSE; } // This function is used for both renumbering and checking the hierarchy. Decide what we have to do: if ($renumber) { // Assign all order values. for ($i = 0; $i <= $depth; $i++) { $info['nodes'][$nid]['order'][$i] = $last_order[$i]; } } else { // Check structure. $order = $values['order'][$depth]; if ($order != $last_order[$depth]) { // This would cause troubles with paging. // We better initiate a rebuild! return FALSE; } } $last_nid = $nid; $last_order[$depth]++; } return TRUE; } /** * Extend View Window * * In order to make it possible to drag from one page to another we have to extend the visible window of each page. * We also have to make sure that parent nodes appear with all their children (..and child nodes with their parent). * * @param $info * The structured info array. Look at _draggableviews_info(..) to learn more. * @param $offset_top * @param $offset_bottom * * @return * An array containing the new, calculated range. */ function _draggableviews_extend_view_window(&$info, $extension_top = NULL, $extension_bottom = NULL) { // Check page settings. if ($info['pager']['items_per_page'] <= 0) { // Nothin to do. Just return the actual range. return array( 'first_index' => 0, 'last_index' => count($info['view']->result) - 1, ); } $items_per_page = $info['view']->pager['items_per_page']; $current_page = $info['view']->pager['current_page']; $offset = $info['view']->pager['offset']; $first_index = $items_per_page * $current_page; $last_index = $items_per_page * ($current_page + 1) - 1; // Now extend the view window. // First of all we need to load the entire view without paging options and reload the info array. _draggableviews_reload_info($info, 0, 0, $offset); $nodes = $info['nodes']; // If the new index is out of range we'll use the last existing index. Calculate this index: $total_index = count($nodes) - 1; // Check permissions and lock. if (!user_access('Allow Reordering') || $info['locked']) { // Don't extend view window. $extension_top = 0; $extension_bottom = 0; } else if (!isset($extension_top) && !isset($extension_bottom)) { $extension_top = $info['view_window_extensions']['extension_top']; $extension_bottom = $info['view_window_extensions']['extension_bottom']; } // Extend on top: $first_index -= $extension_top; if ($first_index < 0) { // Be careful: $first_index < 0. So this is a subtraction! $extension_top += $first_index; if ($extension_top < 0) $extension_top = 0; $first_index = 0; } // Extend on bottom: $last_index += $extension_bottom; if ($last_index > $total_index) { $extension_bottom = $extension_bottom - ($last_index - $total_index); if ($extension_bottom < 0) $extension_bottom = 0; $last_index = $total_index; } if (isset($info['hierarchy'])) { // There are possibly some child nodes that would be cut of their parents. To avoid this we localize // the next parents (if needed) and use their index for the range. To analyze the nodes array we slice out // all nodes before (the B's) and all nodes after (the a's) the current page (the -'s): // // B B B B B B B B B - - - - - - - - A A A A A A A A A A. // // Slice out all nodes before (currently not shown): $nodes_before = array_slice($nodes, 0, $first_index, TRUE); // Slice out all nodes after (currently not shown): $nodes_after = array_slice($nodes, $last_index + 1, NULL, TRUE); // Slice out all nodes that are currently shown: $nodes_current = array_slice($nodes, $first_index, $last_index - $first_index + 1, TRUE); $add_to_extension_top = 0; $add_to_extension_bottom = 0; $first_node = current($nodes_current); if ($first_node['parent'] > 0) { // The first node of the current page is a child node. Look for the next parent // that is on the root level. We can't use foreach() because we iterate the wrong way. $temp_node = end($nodes_before); while ($temp_node !== FALSE) { $add_to_extension_top++; if ($temp_node['parent'] == 0) break; $temp_node = prev($nodes_before); } } // Check for possible children of the last node. foreach ($nodes_after AS $temp_node) { if ($temp_node['parent'] == 0) break; $add_to_extension_bottom++; } // Update range. $first_index -= $add_to_extension_top; $last_index += $add_to_extension_bottom; } // Finally we re-execute the view an reload the info array. We need to add 1 to the number of items // to show (e.g. show from index 5 to index 5: show 5-5+1=1 item). _draggableviews_reload_info($info, $last_index - $first_index + 1, 0, $offset + $first_index); // Mark extended nodes as "extension". $nodes = &$info['nodes']; for ($i = 0; $i < $extension_top + $add_to_extension_top; $i++) { $nid = key($nodes); $nodes[$nid]['extension'] = TRUE; next($nodes); } end($nodes); for ($i = 0; $i < $extension_bottom + $add_to_extension_bottom; $i++) { $nid = key($nodes); $nodes[$nid]['extension'] = TRUE; prev($nodes); } return array( 'first_index' => $first_index, 'last_index' => $last_index, ); } /** * Click Sort * * The nodes are already in the right order. * Simply assign ascending values. * Re-execute view and refresh info array. * * @param $info * The structured info array. Look at _draggableviews_info(..) to learn more. */ function _draggableviews_click_sort(&$info) { // Check permissions. if (!user_access('Allow Reordering')) { drupal_set_message(t('You are not allowed to reorder nodes.'), 'error'); return; } // Check if structure is locked. if ($info['locked']) { drupal_set_message(t('The structure is locked.'), 'error'); return; } // If the items to display per page are limited we load the entire view. $pager = $info['view']->pager; if ($pager['items_per_page'] > 0) { _draggableviews_reload_info($info, 0, 0, 0); } // First bring all child nodes down to the root level. We can't keep the hierarchy information // because the nodes have been mixed up thoroughly. if (isset($info['hierarchy'])) { foreach ($info['nodes'] AS $nid => $values) { $info['nodes'][$nid]['parent'] = 0; $info['nodes'][$nid]['depth'] = 0; } } // Assign ascending numbers _draggableviews_ascending_numbers($info, 0, TRUE); _draggableviews_save_hierarchy($info); // Re-execute view with original page settings. _draggableviews_reload_info($info, $pager['items_per_page'], $pager['current_page'], $pager['offset']); } /** * Save Hierarchy * * @param $info * The structured information array. Look at _draggableviews_info(..) to learn more. */ function _draggableviews_save_hierarchy($info) { // Loop through all nodes. foreach ($info['nodes'] as $nid => $prop) { if (isset($info['hierarchy'])) { $value = $prop['parent']; $handler = $info['hierarchy']['field']['handler']; $handler->save($nid, $value); } for ($i = 0; $i < count($info['order']['fields']); $i++) { // Loop through all order fields. $value = $prop['order'][$i]; $handler = $info['order']['fields'][$i]['handler']; $handler->save($nid, $value); } } } /** * Calculate Depths * * Nodes with broken parents will be brought down to the root level. * * @param $info * The structured information array. Look at _draggableviews_info(..) to learn more. * * @return * TRUE if no errors occured. */ function _draggableviews_calculate_depths(&$info) { $error = FALSE; // Loop through all rows the view returned. foreach ($info['nodes'] as $nid => $prop) { // Determine hierarchy depth of current row. $info['nodes'][$nid]['depth'] = _draggableviews_get_hierarchy_depth($nid, $info['nodes'], $info); if ($info['nodes'][$nid]['depth'] === FALSE) { $error = TRUE; $info['nodes'][$nid]['parent'] = 0; $info['nodes'][$nid]['depth'] = 0; } // Set all unused order fields to the minimum value. $depth = $info['nodes'][$nid]['depth']; for ($i = $depth + 1; $i < count($info['order']['fields']); $i++) { $info['nodes'][$nid]['order'][$i] = $info['order']['fields'][$i]['handler']->get_minimum_value(); } } return !$error; } /** * Get Hierarchy Depth * * This function detects broken parents. * Cycles are detected (if a child is the parent of its parent). * * @param $nid * The nid of the node which should be processed. * @param $nodes * The nodes array. This can be both a nodes array or an input array. * They share the same hierarchy properties. * @param $info * The structured info array. Look at _draggableviews_info(..) to learn more. * * @return * The hierarchy depth if no occured, else FALSE. */ function _draggableviews_get_hierarchy_depth($nid, $nodes, $info) { if (!isset($info['hierarchy'])) return 0; $depth = 0; $error = FALSE; $temp_nid = $nid; $used_nids = array($temp_nid); while (!($error = !isset($nodes[$temp_nid])) && ($temp_nid = $nodes[$temp_nid]['parent']) > 0) { // In order to detect cycles we use an array, // where all used nids are saved in. If a node id // occurs twice -> return FALSE. $cycle_found = array_search($temp_nid, $used_nids); // The isset(..) is necessary because in PHP-Versions <= 4.2.0 array_search() returns NULL // instead of FALSE if $temp_nid was not found. if (isset($cycle_found) && $cycle_found !== FALSE) { drupal_set_message(t("Draggableviews: A cycle was found.")); return FALSE; } $used_nids[] = $temp_nid; $depth++; } if ($error) { // If loop breaked caused by an error. return FALSE; } return $depth; } /** * Detect and Repair Order Values * * The nodes order value has to equal with the parents order value. * * @param $info * The structured information array. Look at _draggableviews_info(..) to learn more. * * @return * TRUE if no error occured. */ function _draggableviews_check_order(&$info) { $error = FALSE; foreach ($info['nodes'] as $nid => $prop) { if (_draggableviews_check_node_order($nid, $info) == FALSE) { $error = TRUE; } else if ($prop['depth'] > 0) { // Set the parent node order of the current level to 0 (B in the example). This should prevent // broken structures caused by "bad nodes" (A in the example) with the same order at the parents level. // B (0 -1) The parent of C // A (0 -1) A bad node // --C (0 1) The child node of B // We take advantage of this when we sort the nodes. _draggableviews_ascending_numbers() will // overwrite this value with the minimum value afterwards. $parent = $prop['parent']; $depth = $prop['depth']; $info['nodes'][$parent]['order'][$depth] = 0; } } return $error; } /** * Check Node Order Value * * We rely on the correctness of depth values and parent values. * The order values of each level have to equal with the values of the parent nodes. * * @param $nid * The node id to check. * @param $info * The structured information array. Look at _draggableviews_info(..) to learn more. * * @return * TRUE if no errors were found. */ function _draggableviews_check_node_order($nid, &$info) { $error = FALSE; $nodes = &$info['nodes']; $temp_nid = $nodes[$nid]['parent']; for ($i = $nodes[$nid]['depth'] - 1; $i >= 0; $i--) { // We're operating top-down, so we determine the parents nid by the way. if ($nodes[$nid]['order'][$i] != $nodes[$temp_nid]['order'][$i]) { $nodes[$nid]['order'][$i] = $nodes[$temp_nid]['order'][$i]; $error = TRUE; } $temp_nid = $nodes[$temp_nid]['parent']; } return !$error; } /** * Reload Info Array * * @param $info * The structured info array. Look at _draggableviews_info(..) to learn more. * @param $items_per_page * @param $current_page */ function _draggableviews_reload_info(&$info, $items_per_page = NULL, $current_page = NULL, $offset = NULL) { // Re-execute the view because order values may have changed. _draggableviews_re_execute_view($info['view'], $items_per_page, $current_page, $offset); // Reload nodes of the info array. $info = _draggableviews_info($info['view'], $info); } /** * Re-execute View * * @param $view * The view object. * @param $items_per_page * @param $current_page * @param $offset */ function _draggableviews_re_execute_view(&$view, $items_per_page = NULL, $current_page = NULL, $offset = NULL) { if (isset($items_per_page)) $view->set_items_per_page($items_per_page); if (isset($current_page)) { $view->pager['current_page'] = $current_page; // Views pager uses global variables where all already known information is dumped in. // We need to change the global variable $pager_page_array in order to set the page to 0 because // this variable would force the current page to another value. (see views/includes/view.inc:#717, function execute()) global $pager_page_array; $pager_page_array[$view->pager['element']] = $current_page; } if (isset($offset)) $view->set_offset($offset); $view->executed = FALSE; $view->execute(); } /** * Get Handler Instance * * @param $field * The field options specified in the style plugin. * @param $view * The view object. * * @return * A handler instance. */ function _draggableviews_init_handler($field, &$view) { if (isset($field['handler'])) { $handler_info = draggableviews_discover_handlers($field['handler']); $file = $handler_info['path'] .'/'. $handler_info['file']; if ($handler_info['path'] && $handler_info['file'] && file_exists($file)) { require_once($file); $handler = new $handler_info['handler']; $handler->init($field['field'], $view); return $handler; } else { return FALSE; } } else { return FALSE; } } /** * Sort Nodes * * @param $nodes * The nodes array to sort. */ function _draggableviews_sort_nodes(&$nodes) { uasort($nodes, '_draggableviews_compare_nodes'); } /** * Compare Nodes (used by uasort) * * * @param $node1 * @param $node2 * * @return * < or > or == */ function _draggableviews_compare_nodes($node1, $node2) { // The first difference will be significant. If they equal in each level we // "survive" the loop and end up with return 0. for ($i = 0; $i < count($node1['order']); $i++) { // First compare the order values.. if ($node1['order'][$i] < $node2['order'][$i]) return -1; if ($node1['order'][$i] > $node2['order'][$i]) return 1; } return 0; }