我试图按顺序对数组进行排序，但是当我使用sort或sort array等时，它给了我未定义的偏移量错误。如果不进行排序，它就完美了！
脚本：
class Dynamic_menu {
private $ci; // for CodeIgniter Super Global Reference.
private $id_menu = 'class="collapse navbar-collapse" id="bs-example-navbar-collapse-1"';
private $class_menu = 'class="nav navbar-nav"';
private $class_parent = 'class="parent"';
private $class_last = 'class="last"';
// --------------------------------------------------------------------
/**
* PHP5 Constructor
*
*/
function __construct()
{
$this->ci =& get_instance(); // get a reference to CodeIgniter.
}
// --------------------------------------------------------------------
/**
* build_menu($table, $type)
*
* Description:
*
* builds the Dynaminc dropdown menu
* $table allows for passing in a MySQL table name for different menu tables.
* $type is for the type of menu to display ie; topmenu, mainmenu, sidebar menu
* or a footer menu.
*
* @param string the MySQL database table name.
* @param string the type of menu to display.
* @return string $html_out using CodeIgniter achor tags.
*/
function build_menu($menu_id)
{
$menu = array();
// use active record database to get the menu.
//$this->ci->db->order_by('orders', 'asc');
//$query = $this->ci->db->get('menus_data');
//$query = $this->ci->db->get($table);
$this->ci->db->select("*");
$this->ci->db->from("menus_data");
// $this->ci->db->where("menu_id", $menu_id);
$query = $this->ci->db->get();
if ($query->num_rows() > 0)
{
// `id`, `title`, `link_type`, `page_id`, `module_name`, `url`, `uri`, `dyn_group_id`, `position`, `target`, `parent_id`, `show_menu`
foreach ($query->result() as $row)
{
$menu[$row->id]['id'] = $row->id;
$menu[$row->id]['title'] = $row->menu_title;
//$menu[$row->id]['link'] = $row->link_type;
$menu[$row->id]['page'] = $row->page_id;
//$menu[$row->id]['module'] = $row->module_name;
$menu[$row->id]['url'] = $row->menu_url;
//$menu[$row->id]['uri'] = $row->uri;
//$menu[$row->id]['dyn_group'] = $row->dyn_group_id;
$menu[$row->id]['orders'] = $row->orders;
//$menu[$row->id]['target'] = $row->target;
$menu[$row->id]['parent'] = $row->parent_id;
$menu[$row->id]['is_parent'] = $row->is_parent;
$menu[$row->id]['show'] = $row->visable;
}
}
$query->free_result(); // The $query result object will no longer be available
// ----------------------------------------------------------------------
// now we will build the dynamic menus.
$html_out = "\t".'<div '.$this->id_menu.'>'."\n";
$html_out .= "\t\t".'<ul '.$this->class_menu.'>'."\n";
// asort($menu);
usort($menu, function($a, $b) {
return $a['orders'] - $b['orders'];
});
// loop through the $menu array() and build the parent menus.
for ($i = 0; $i < count($menu); $i++)
{
if (is_array($menu[$i])) // must be by construction but let's keep the errors home
{
if ($menu[$i]['show'] && $menu[$i]['parent'] == 0) // are we allowed to see this menu?
{
if ($menu[$i]['is_parent'] == TRUE)
{
// CodeIgniter's anchor(uri segments, text, attributes) tag.
$html_out .= "\t\t\t".'<li class="dropdown">'.anchor($menu[$i]['url'], ''.$menu[$i]['title'].'<span class="caret"></span>', 'class="dropdown-toggle" data-toggle="dropdown" role="button" aria-haspopup="true" aria-expanded="false"');
}
else
{
$html_out .= "\t\t\t\t".'<li>'.anchor($menu[$i]['url'], '<span>'.$menu[$i]['title'].'</span>');
}
// loop through and build all the child submenus.
$html_out .= $this->get_childs($menu, $i);
$html_out .= '</li>'."\n";
}
}
else
{
exit (sprintf('menu nr %s must be an array', $i));
}
}
$html_out .= "\t\t".'</ul>' . "\n";
$html_out .= "\t".'</div>' . "\n";
return $html_out;
}
/**
* get_childs($menu, $parent_id) - SEE Above Method.
*
* Description:
*
* Builds all child submenus using a recurse method call.
*
* @param mixed $menu array()
* @param string $parent_id id of parent calling this method.
* @return mixed $html_out if has subcats else FALSE
*/
function get_childs($menu, $parent_id)
{
$has_subcats = FALSE;
$html_out = '';
$html_out .= "\t\t\t\t\t".'<ul class="dropdown-menu">'."\n";
for ($i = 0; $i < count($menu); $i++)
{
if ($menu[$i]['show'] && $menu[$i]['parent'] == $parent_id) // are we allowed to see this menu?
{
$has_subcats = TRUE;
if ($menu[$i]['is_parent'] == TRUE)
{
$html_out .= "\t\t\t\t\t\t".'<li>'.anchor($menu[$i]['url'], '<span>'.$menu[$i]['title'].'</span>');
}
else
{
$html_out .= "\t\t\t\t\t\t".'<li>'.anchor($menu[$i]['url'], '<span>'.$menu[$i]['title'].'</span>');
}
// Recurse call to get more child submenus.
$html_out .= $this->get_childs($menu, $i);
$html_out .= '</li>' . "\n";
}
}
$html_out .= "\t\t\t\t\t".'</ul>' . "\n";
return ($has_subcats) ? $html_out : FALSE;
}
}
打印结果：
Array ( [0] => Array ( [id] => 5 [title] => testurl [page] => 0 [url] => http://www.google.nl [orders] => 0 [parent] => 0 [is_parent] => 1 [show] => 1 ) [1] => Array ( [id] => 3 [title] => Home2 [page] => 1 [url] => [orders] => 0 [parent] => 0 [is_parent] => 0 [show] => 0 ) [2] => Array ( [id] => 2 [title] => Jantje [page] => 3 [url] => /home/jantje [orders] => 1 [parent] => 5 [is_parent] => 0 [show] => 1 ) [3] => Array ( [id] => 4 [title] => Jantje2 [page] => 3 [url] => [orders] => 1 [parent] => 3 [is_parent] => 0 [show] => 0 ) [4] => Array ( [id] => 1 [title] => Home [page] => 1 [url] => / [orders] => 2 [parent] => 0 [is_parent] => 1 [show] => 1 ) [5] => Array ( [id] => 6 [title] => Demo [page] => 2 [url] => /demo [orders] => 3 [parent] => 1 [is_parent] => 0 [show] => 1 ) )
有人可以帮我解决这个问题吗？
谢谢
您应该从1迭代到6，而应该从0迭代到5。更改：
for ($i = 1; $i <= count($menu); $i++)
到：
for ($i = 0; $i < count($menu); $i++)
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我来说两句