PHP Smarty page static plus paging and cache control

PHP page

<?php //open Output Control buffer Ob_start ();//new template file $file =  "./cache/newindex{$_get[' page ']}.html"; $cachetime  = 10;const  DSN =  ' Mysql:host=localhost;dbname=test ';const    dbuser =  ' root ';const   dbpwd     =  ' root ';// Template does not exist or exceeds cache time to generate a cache template if (!file_exists ($file)  | |  filemtime ($file) + $cachetime <time ()) {//Create Smarty Object require_once  './libs/smarty.class.php '; require_ once  ' page.class.php ';//define root directory define (' root ',  str_replace ("\ \",  "/", DirName (__file__)). " /");//Instantiate Smarty Class $smarty=new smarty ();//Set delimiter $smarty->left_delimiter=" <{"; $smarty->right_ Delimiter= "}>";//set to false  the bounding symbol can have spaces $smarty->auto_literal = false;//add a plugin directory//$smarty- >setpluginsdir (ROOT. " /libs/myplugins/");//Note Add a plug-in, to the system default path to add   otherwise cannot use the default system plug-in $smarty->setpluginsdir (Array (     root. " /libs/plugins/",//system default set path     root." /libs/myplugins/",//Custom));//Connect Database try{     $pdo  = new pdo (dsn, dbuser,dbpwd);} catch (pdoexception  $e) {    echo  "database connection failed:". $e->getmessage ();     exit;} $query  =  "Select id, username, password,email from users limit 3" , $stmt  =  $pdo->prepare ($query), $stmt  ->execute (), $users  =  $stmt->fetchall ( PDO::FETCH_ASSOC); $smarty->assign (' users ', $users);//var_dump ($users); $query  =  "Desc users"; $ stmt =  $pdo->prepare ($query); $stmt  ->execute (); $tdname  =  $stmt->fetchall (PDO :: Fetch_column);//var_dump ($tdname); $page  = new page (20, 2); $smarty->assign (' Tdname ', $ Tdname); $smarty->assign (' fpage ', $page->fpage ());//variable Output $smarty->display (' hello.tpl ');//Returns the contents of the output buffer $ Content = ob_get_contents ();//Writes a string to the file File_put_contents ("./cache/newindex{$_get[' page ']}.html",  $content);//Flushes out (sends out) the contents of the output buffer Ob_flush ();echo  "cache file does not exist, query the database, generate the cache file, output to the browser"; else{    include  $file;    echo  "load cache files directly";}? >

Template TPL page

Browser page
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PHP Smarty page static plus paging and cache control