PHP simple cache, how to assign the page code to the variable?

You can see a good cache class in the open source file, as follows: {code ...} then create a simple php file: {code ...} the following is a question: $ contentdate (& #039; H: I: sjSF & #039;); what should I do if I change to the PHO page content? {Code...} shows a good cache class in the open source file, as follows:

  Dir_isvalid ($ dir) {$ this-> dir = $ dir; $ this-> lifetime = $ lifetime; $ this-> ext = '. php '; $ this-> cacheid = $ this-> getcacheid () ;}/ *** check whether the cache is valid */private function isvalid () {if (! File_exists ($ this-> cacheid) return false; if (! (@ $ Mtime = filemtime ($ this-> cacheid) return false; if (mktime ()-$ mtime> $ this-> lifetime) return false; return true ;} /*** write cache ** $ mode = 0. obtain the page content in browser cache * $ mode = 1 and assign values directly (received by the $ content parameter) obtain the page content in the form of * $ mode = 2, and obtain the page content locally (fopen ile_get_contents) (it seems that this method is unnecessary) */public function write ($ mode = 0, $ content = '') {switch ($ mode) {case 0: $ content = ob_get_contents (); break; default: brea K;} ob_end_flush (); try {file_put_contents ($ this-> cacheid, $ content);} catch (Exception $ e) {$ this-> error ('write cache failed! Check the directory permission! ') ;}}/*** Load cache * exit () after loading the cache, terminate the execution of the original page program. if the cache is invalid, run the original page program to generate the cache * ob_start () enable browser Cache to get page content at the end of the page */public function load () {if ($ this-> isvalid () {echo "This is Cache. "; // which of the following two methods is better ????? Require_once ($ this-> cacheid); // echo file_get_contents ($ this-> cacheid); exit () ;}else {ob_start ();}} /*** clear cache */public function clean () {try {unlink ($ this-> cacheid);} catch (Exception $ e) {$ this-> error ('failed to clear the cached file! Check the directory permission! ') ;}}/*** Obtain the cache file path */private function getcacheid () {return $ this-> dir. md5 ($ this-> geturl ()). $ this-> ext;}/*** check whether the directory exists or can be created */private function dir_isvalid ($ dir) {if (is_dir ($ dir) return true; try {mkdir ($ dir, 0777);} catch (Exception $ e) {$ this-> error ('The specified cache directory does not exist and creation failed! Check the directory permission! '); Return false;} return true;}/*** get the complete url of the current page */private function geturl () {$ url = ''; if (isset ($ _ SERVER ['request _ URI ']) {$ url = $ _ SERVER ['request _ URI'];} else {$ url = $ _ SERVER ['php _ SELF ']; $ url. = empty ($ _ SERVER ['query _ string'])? '':'? '. $ _ SERVER ['query _ string'];} return $ url;}/*** output error message */private function error ($ str) {echo'
'. $ Str .'
';}}?>

Create a simple php file by yourself:

  Load () ;}// page code start $ content = date ('H: I: s jS f'); echo $ content; // page code end if (CACHEENABLE) {$ cache-> write (1, $ content); // The first time the cache is running or expires, the cache is generated}?>

The following is a question: $ content = date ('H: I: s jS f'); what should I do if I change to the PHO page content?

$ Content = <      
      
      
      
      Bootstrap 101 template.ap-southeast-1.maxcompute.aliyun-inc.com/api