How is clear page cache in the CodeIgniter

You need to manually delete the cached items in the application/cache folder.

https://www.codeigniter.com/user_guide/general/caching.html

function delete_cache($uri_string=null){    $CI =& get_instance();    $path = $CI->config->item('cache_path');    $path = rtrim($path, DIRECTORY_SEPARATOR);    $cache_path = ($path == '') ? APPPATH.'cache/' : $path;    $uri =  $CI->config->item('base_url').            $CI->config->item('index_page').            $uri_string;    $cache_path .= md5($uri);    return unlink($cache_path);}

public function clear_path_cache($uri){    $CI =& get_instance();    $path = $CI->config->item('cache_path');    //path of cache directory    $cache_path = ($path == '') ? APPPATH.'cache/' : $path;    $uri =  $CI->config->item('base_url').    $CI->config->item('index_page').    $uri;    $cache_path .= md5($uri);    return @unlink($cache_path);}/** * Clears all cache from the cache directory */public function clear_all_cache(){    $CI =& get_instance();    $path = $CI->config->item('cache_path');    $cache_path = ($path == '') ? APPPATH.'cache/' : $path;    $handle = opendir($cache_path);    while (($file = readdir($handle))!== FALSE)     {        //Leave the directory protection alone        if ($file != '.htaccess' && $file != 'index.html')        {           @unlink($cache_path.'/'.$file);        }    }    closedir($handle);       }