实现简单 codeigniter 缓存 (cache)

代码

 

class Test extends Controller {
 
	function main()
	{
 
		// load the library
		$this->load->library('simple_cache');
 
		// key is the name you have given to the cached data
		// will check if the item is cached
		if (!$this->simple_cache->is_cached('key'))
		{
			// not cached, do our things that need caching
			$data = array('print' => 'Hello World');
 
			// store in cache
			$this->simple_cache->cache_item('key', $data);
 
		} else {
			$data = $this->simple_cache->get_item('key');
		}
 
		$this->load->view('hello', $data);
	}
 
}

 

 

simple cache library

 

<?php

/*

    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>.

*/


class Simple_cache {

	public $expire_after = 300;
	public $cache_file   = BASEPATH.'cache/';

	function Simple_cache($life_time = '')
	{
		if (!empty($life_time))
		{
			 $this->expire_after = $life_time;
		}
	}

	function cache_item($key, $value)
	{
		if(!is_dir($this->cache_file))
		{
			$temp = explode('/',$this->cache_file);  
			$cur_dir = '';  
			for($i = 0; $i < count($temp); $i++)
			{  
				$cur_dir .= $temp[$i].'/';  
				if (!is_dir($cur_dir))
				{  
					@mkdir($cur_dir,0755);  
				}  
			}  
		}

		if(!empty($value))
		{
			file_put_contents($this->cache_file.sha1($key).'.cache', serialize($value));	
		}
	}
	
	function is_cached($key)
	{
		if (file_exists($this->cache_file.sha1($key).'.cache')){
		{			
			if((filectime($this->cache_file.sha1($key).'.cache')+$this->expire_after) >= time()))
			{
				return true;
			}else{
				delete_item($key);
				return false;
			}
		} else {
			return false;			
		}		
	}
	
	function get_item($key)
	{
		$item = file_get_contents($this->cache_file.sha1($key).'.cache');
		return unserialize($item);
	}
	
	function delete_item($key)
	{
		unlink($this->cache_file.sha1($key).'.cache');
	}

	function clear_all(){

	}

}