CI中实现两种风格路由
在支持url path_info 以及 url_rewrite 的环境中.CI 可以生成非常友好的url .但是如果某个环境不支持path_info 以及 url_rewrite ,如何让CI 自动生成传统的url ,形如:
http://localhost/codeigniter172/index.php?c=blog&m=nodes&per_page=6
步骤:
(1) application/config/config.php中
$config['uri_protocol'] = "AUTO";
$config['enable_query_strings'] = TRUE; // 默认值为false.此刻我们开启.为了让它生成传统的url.
//新增一项.应用程序入口,单一入口程序常用的做法.
$config['app_entrance'] = "index.php";
(2).重载site_url()
新建 application/libraries/MY_Config.php
<?php
class MY_Config extends CI_Config
{
function site_url($uri)
{
if(!$this->item('enable_query_strings')){
return parent::site_url($uri);
}
else{
$class_key = $this->item('controller_trigger');
$func_key = $this->item('function_trigger');
if (!$uri)
{
return $this->slash_item('base_url');
}
else
{
$app_entrance = ($this->item('app_entrance'))? $this->item('app_entrance') : "index.php" ;
$last = '';
$uri = trim($uri,'/');
$arr = explode('/',$uri);
$func = (isset($arr))? '&'.$func_key.'='.$arr:'';
if(count($arr)>2){
$arr_parms = array();
$arr_last = array_slice($arr,2);
$i = 1;
foreach ($arr_last as $v){
$arr_parms[] = 'parms'.$i++.'='.$v;
}
$last ='&'.implode("&",$arr_parms);
}
$uri = "$app_entrance?$class_key={$arr}$func";
return $this->slash_item('base_url').$uri.$last;
}
}
}
}
?>
(3)
重载_explode_segments()
是为了采用统一的方式获取 get 变量 .如 从该 url : http://localhost/codeigniter172/index.php?c=blog&m=nodes&per_page=6
$this->uri->segements(3) 即获取 $_GET['per_page'] 的值 .
新建 application/libraries/MY_URI.php
<?php
class MY_URI extends CI_URI
{
function _explode_segments()
{
if(!$this->config->item('enable_query_strings')){
parent::_explode_segments();
}
else
{
if(empty($_SERVER['QUERY_STRING'])){
show_error('Current Url error',500);
}
$this->segments = 'NOUSE';
$i = 0;
$arr_parms = explode('&',$_SERVER['QUERY_STRING']);
foreach ($arr_parms as $v){
$arr_v = explode('=',$v);
$this->segments[++$i] = $arr_v;
}
}
}
}
?>
(4) 重载 _set_routing()
目的是为了采用传统url 处理 MVC时,能够执行 _explode_segments()
新增 application/libraries/MY_Router.php
<?php
class MY_Router extends CI_Router
{
function _set_routing()
{
// Are query strings enabled in the config file?
// If so, we're done since segment based URIs are not used with query strings.
if ($this->config->item('enable_query_strings') === TRUE AND isset($_GET[$this->config->item('controller_trigger')]))
{
$this->set_class(trim($this->uri->_filter_uri($_GET[$this->config->item('controller_trigger')])));
if (isset($_GET[$this->config->item('function_trigger')]))
{
$this->set_method(trim($this->uri->_filter_uri($_GET[$this->config->item('function_trigger')])));
}
//must process the url into segmets array.so we can use an uniform method to get .
//仅仅新增了下面这一行.
$this->uri->_explode_segments();
return;
}
// Load the routes.php file.
@include(APPPATH.'config/routes'.EXT);
$this->routes = ( ! isset($route) OR ! is_array($route)) ? array() : $route;
unset($route);
// Set the default controller so we can display it in the event
// the URI doesn't correlated to a valid controller.
$this->default_controller = ( ! isset($this->routes['default_controller']) OR $this->routes['default_controller'] == '') ? FALSE : strtolower($this->routes['default_controller']);
// Fetch the complete URI string
$this->uri->_fetch_uri_string();
// Is there a URI string? If not, the default controller specified in the "routes" file will be shown.
if ($this->uri->uri_string == '')
{
if ($this->default_controller === FALSE)
{
show_error("Unable to determine what should be displayed. A default route has not been specified in the routing file.");
}
if (strpos($this->default_controller, '/') !== FALSE)
{
$x = explode('/', $this->default_controller);
$this->set_class(end($x));
$this->set_method('index');
$this->_set_request($x);
}
else
{
$this->set_class($this->default_controller);
$this->set_method('index');
$this->_set_request(array($this->default_controller, 'index'));
}
// re-index the routed segments array so it starts with 1 rather than 0
$this->uri->_reindex_segments();
log_message('debug', "No URI present. Default controller set.");
return;
}
unset($this->routes['default_controller']);
// Do we need to remove the URL suffix?
$this->uri->_remove_url_suffix();
// Compile the segments into an array
$this->uri->_explode_segments();
// Parse any custom routing that may exist
$this->_parse_routes();
// Re-index the segment array so that it starts with 1 rather than 0
$this->uri->_reindex_segments();
}
}
?>
完成上述步骤后,如果你想采用传统url (不是搜索引擎友好的url) 访问,只需要将 $config['enable_query_strings'] = TRUE;
这时: siet_url('blog/edit/15') 生成的url 即为: http://localhost/codeigniter172/index.php?c=blog&m=edit¶ms1=15;
如果把 $config['enable_query_strings'] = false;
site_url('blog/edit/15') 生成的url 即为: http://localhost/codeigniter172/blog/edit/15
因此,你在开发过程中所有生成url 的地方,都应采用 site_url() 这个函数去完成. 部署到server 时,如果server 不支持 path_info 或者 url_rewrite. 无需大量改动
只需改一个配置参数即可. 基于以上思想,发现CI_Calendar 类中有些问题.
CI_Calendar 的 generate 方法 中对"上一月", "下一月"的link url 处理,应该算是一个bug,我觉得.CI 的下一个版本应该修正这个bug.
因为CI_Pagenation 类中 是有作类似的处理的.
if ($CI->config->item('enable_query_strings') === TRUE OR $this->page_query_string === TRUE)
{
$this->base_url = rtrim($this->base_url).'&'.$this->query_string_segment.'=';
}
else
{
$this->base_url = rtrim($this->base_url, '/') .'/';
}
(第 160 行 往下看)
//this is a bug---should be fixed.
//$out .= str_replace('{previous_url}', $this->next_prev_url.$adjusted_date['year'].'/'.$adjusted_date['month'], $this->temp['heading_previous_cell']);
if ($this->CI->config->item('enable_query_strings') === TRUE )
{
$out .= str_replace('{previous_url}', $this->next_prev_url.'&params1='.$adjusted_date['year'].'&params2='.$adjusted_date['month'], $this->temp['heading_previous_cell']);
}
else
$out .= str_replace('{previous_url}', $this->next_prev_url.$adjusted_date['year'].'/'.$adjusted_date['month'], $this->temp['heading_previous_cell']);
.....
// "next" month link
if ($this->show_next_prev == TRUE)
{
$adjusted_date = $this->adjust_date($month + 1, $year);
if ($this->CI->config->item('enable_query_strings') === TRUE )
$out .= str_replace('{next_url}', $this->next_prev_url.'&params1='.$adjusted_date['year'].'&params2='.$adjusted_date['month'], $this->temp['heading_next_cell']);
else
$out .= str_replace('{next_url}', $this->next_prev_url.$adjusted_date['year'].'/'.$adjusted_date['month'], $this->temp['heading_next_cell']);
}
很有用~~~
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