Grav\Plugin\Admin\AdminController::taskSave PHP Method

    public function taskSave()
    {
        if (!$this->authorizeTask('save', $this->dataPermissions())) {
            return false;
        }
        $reorder = true;
        $data = (array) $this->data;
        $config = $this->grav['config'];
        // Special handler for pages data.
        if ($this->view == 'pages') {
            /** @var Pages $pages */
            $pages = $this->grav['pages'];
            // Find new parent page in order to build the path.
            $route = !isset($data['route']) ? dirname($this->admin->route) : $data['route'];
            /** @var Page $obj */
            $obj = $this->admin->page(true);
            // Ensure route is prefixed with a forward slash.
            $route = '/' . ltrim($route, '/');
            if (isset($data['frontmatter']) && !$this->checkValidFrontmatter($data['frontmatter'])) {
                $this->admin->setMessage($this->admin->translate('PLUGIN_ADMIN.INVALID_FRONTMATTER_COULD_NOT_SAVE'), 'error');
                return false;
            }
            //Handle system.home.hide_in_urls
            $hide_home_route = $config->get('system.home.hide_in_urls', false);
            if ($hide_home_route) {
                $home_route = $config->get('system.home.alias');
                $topParent = $obj->topParent();
                if (isset($topParent)) {
                    if ($topParent->route() == $home_route) {
                        $baseRoute = (string) $topParent->route();
                        if ($obj->parent() != $topParent) {
                            $baseRoute .= $obj->parent()->route();
                        }
                        $route = isset($baseRoute) ? $baseRoute : null;
                    }
                }
            }
            $parent = $route && $route != '/' && $route != '.' ? $pages->dispatch($route, true) : $pages->root();
            $original_slug = $obj->slug();
            $original_order = intval(trim($obj->order(), '.'));
            // Change parent if needed and initialize move (might be needed also on ordering/folder change).
            $obj = $obj->move($parent);
            $this->preparePage($obj, false, $obj->language());
            // Reset slug and route. For now we do not support slug twig variable on save.
            $obj->slug($original_slug);
            try {
                $obj->validate();
            } catch (\Exception $e) {
                $this->admin->setMessage($e->getMessage(), 'error');
                return false;
            }
            $obj->filter();
            // rename folder based on visible
            if ($original_order == 1000) {
                // increment order to force reshuffle
                $obj->order($original_order + 1);
            }
            // add or remove numeric prefix based on ordering value
            if (isset($data['ordering'])) {
                if ($data['ordering'] && !$obj->order()) {
                    $obj->order($this->getNextOrderInFolder($obj->parent()->path()));
                    $reorder = false;
                } elseif (!$data['ordering'] && $obj->order()) {
                    $obj->folder($obj->slug());
                }
            }
        } else {
            // Handle standard data types.
            $obj = $this->prepareData($data);
            try {
                $obj->validate();
            } catch (\Exception $e) {
                $this->admin->setMessage($e->getMessage(), 'error');
                return false;
            }
            $obj->filter();
        }
        $obj = $this->storeFiles($obj);
        if ($obj) {
            // Event to manipulate data before saving the object
            $this->grav->fireEvent('onAdminSave', new Event(['object' => &$obj]));
            $obj->save($reorder);
            $this->admin->setMessage($this->admin->translate('PLUGIN_ADMIN.SUCCESSFULLY_SAVED'), 'info');
            $this->grav->fireEvent('onAdminAfterSave', new Event(['object' => $obj]));
        }
        if ($this->view != 'pages') {
            // Force configuration reload.
            /** @var Config $config */
            $config = $this->grav['config'];
            $config->reload();
            if ($this->view === 'user') {
                $this->grav['user']->merge(User::load($this->admin->route)->toArray());
            }
        }
        // Always redirect if a page route was changed, to refresh it
        if ($obj instanceof Page) {
            if (method_exists($obj, 'unsetRouteSlug')) {
                $obj->unsetRouteSlug();
            }
            $multilang = $this->isMultilang();
            if ($multilang) {
                if (!$obj->language()) {
                    $obj->language($this->grav['session']->admin_lang);
                }
            }
            $admin_route = $this->admin->base;
            //Handle system.home.hide_in_urls
            $route = $obj->rawRoute();
            $hide_home_route = $config->get('system.home.hide_in_urls', false);
            if ($hide_home_route) {
                $home_route = $config->get('system.home.alias');
                $topParent = $obj->topParent();
                if (isset($topParent)) {
                    $top_parent_route = (string) $topParent->route();
                    if ($top_parent_route == $home_route && substr($route, 0, strlen($top_parent_route) + 1) != $top_parent_route . '/') {
                        $route = $top_parent_route . $route;
                    }
                }
            }
            $redirect_url = ($multilang ? '/' . $obj->language() : '') . $admin_route . '/' . $this->view . $route;
            $this->setRedirect($redirect_url);
        }
        return true;
    }