Showing Posts From

Php cache system

Implement caching in php website

Hi Experts, Today i am sharing you Step by Step instructions for Implement caching in php website. First of all we have to understand that what is cache exactly and how cache exactly works . What is cache ? Cache is a technique to optimize web page speed,load time and execution . it just reduces database calls and load by delivering contend by cached pages or objects which we saved in file-system or objects .We can Achieve cache with multiple logic like File Storage Cache(Most popular & this article is about itself),Object Stored cache( like Memcache),Application level cache (like Varnish Cache) ,SQL Query Cache. Simply Cache is not a logic or program it is just a concept and that can be achieve with multiple logic or programs/techniques as above. Now See that How Cache works with Server and Client See in Following Figure.Now Step by Step Implement caching in php website Step 1 : Create a Cache class with file name cache.class.php in your website root directory cache_ext=$cache_ext; $this->cache_time=$cache_time; $this->cache_folder=$cache_folder; $this->ignore_pages=$ignore_pages; $this->dynamic_url = "http://".$_SERVER['HTTP_HOST']. $_SERVER['REQUEST_URI'] . $_SERVER['QUERY_STRING']; $this->_cache_file = $this->cache_folder. md5($this->dynamic_url).$this->cache_ext; $this->_ignore_status = (in_array($this->dynamic_url,$this->ignore_pages))?true:false; if($cache_enable==1) { if (!$this->_ignore_status && file_exists($this->_cache_file) && time() - $this->cache_time _cache_file)) { //check Cache exist and it's not expired. ob_start('ob_gzhandler'); //Turn on output buffering, "ob_gzhandler" for the compressed page with gzip. readfile($this->_cache_file); //read Cache file echo '_cache_file)).', Page : '.$this->dynamic_url.' -->'; ob_end_flush(); //Flush and turn off output buffering exit(); //no need to proceed further, exit the flow. } } //Turn on output buffering with gzip compression. ob_start('ob_gzhandler'); }}?>Step 2 : Put Following code Before your website header file/template file or any file where you want to achieve cache. Note : this code should be always upper from your tag starts.Step 3 : In the Footer template or page just After the close tag. cache_folder)) { //create a new folder if we need to mkdir($cache_obj->cache_folder); } if(!$cache_obj->_ignore_status){ $fp = fopen($cache_obj->_cache_file, 'w'); //open file for writing fwrite($fp, ob_get_contents()); //write contents of the output buffer in Cache file fclose($fp); //Close file pointer } ob_end_flush(); //Flush and turn off output buffering?>Step 4 : Check you page and see that for the time you set in code or by default 1 hour you webpage will give same output for all users very quickly. Question : how to verify that cache is implemented or not Answer : load your webpage where you implement this cache system after it CTRL+U or see page source. in that in last of your code there will be a html comment having following text ” cached page by cache class by w3school ” Now Enjoy the Script by https://www.w3school.info/