PHP Development App Interface Learning notes and summary-app interface example [3] Home App interface Development ② Read cache mode

Take the static cache as an example.

Modify file.php line:11 Remove the Path parameter (convenient), plus the cache time parameter:

 Public function cachedata ($k,$v = ",$cacheTime = 0) {     // filename       $filename$this->_dir.$k. Self::EXT;       .....

The line:25 sets the cache time to 11 digits, and if it is less than 11 bits, it is 0 before the time. And then splicing the cache time and cache content:

$cacheTime sprintf ('%011d ',$cacheTime);    // $cacheTime set to 11-bit (convenient interception), less than 11 front complement 0//the cache time stitching $v return file_put_contents ($filename,$cacheTime. Json_encode ($v));

Test it:

$file New Cache (); $file->cachedata (' Data ', ' Index-data ', 50);

Open Data.txt:

00000000050 "Index-data"

Then modify the Read cache line33:

$contents=file_get_contents($filename);$cacheTime= (int)substr($contents, 0,11);$val=substr($contents, 11);if($cacheTime! = 0 &&$cacheTime+Filemtime($filename) < Time()){//Cache has expired    unlink($filename); return false;}returnJson_decode ($val,true);

Introduction of file.php in list.php

Modify Line:14

$cache=NewCache ();$vals=Array();if(!$vals=$cache->cachedata (' Index-data ').$page.‘ -‘.$pageSize)){    //echo ' aaaa '; exit ();//test cache invalidation    Try{        $connect= Db::getinstance ()Connect (); }Catch(Exception $e){        returnResponse::show (403, ' Database connection failed '); }    $res=mysql_query($sql,$connect);  while($val=Mysql_fetch_assoc($res)){        $vals[] =$val;//two-dimensional arrays    }    if($vals){        $cache->cachedata (' Index-data ').$page.‘ -‘.$pageSize,$vals, 50); }

Test page:

Http://127.0.0.17/php/APP/list.php?pageSize=10&page=3

When the cache fails (no comment echo ' aaaa '; exit (); ), page output: AAA

list.php

<?PHPrequire_once' Response.php ';require_once' Db.php ';require_once' File.php ';$page=isset($_get[' page '])?$_get[' Page ']:1;$pageSize=isset($_get[' PageSize '])?$_get[' PageSize ']:1;if(!Is_numeric($page) || !Is_numeric($pageSize)){    return@Response:: Show (401, ' data not valid '));}$offset= ($page-1) *$pageSize;//number of start per page$sql= ' SELECT * from review where is_enabled = 1 order BY creation_time desc limit '.$offset.‘,‘.$pageSize;$cache=NewCache ();$vals=Array();//When there is no cache or cache is invalidated, connect to the database and fetch data from the database//Note that paging information needs to be written to the file name when there is paging dataif(!$vals=$cache->cachedata (' Index-data ').$page.‘ -‘.$pageSize)){    //echo ' aaaa '; exit ();//test cache invalidation    Try{        $connect= Db::getinstance ()Connect (); }Catch(Exception $e){        returnResponse::show (403, ' Database connection failed '); }    $res=mysql_query($sql,$connect);  while($val=Mysql_fetch_assoc($res)){        $vals[] =$val;//two-dimensional arrays    }    //at the same time, the extracted data is cached    if($vals){        $cache->cachedata (' Index-data ').$page.‘ -‘.$pageSize,$vals, 50); }}//if the cache exists and is not invalidated, encapsulate the data in the cache using the encapsulated interface classif($vals){    returnResponse::show (200, ' Home data acquisition success ',$vals);}Else{    returnResponse::show (400, ' Home data acquisition failed ',$vals);}

Test http://127.0.0.17/php/APP/list.php?pageSize=10&page=3 Build Index-data3-10.txt

Test http://127.0.0.17/php/APP/list.php?pageSize=10 Build Index-data1-10.txt

Attached: file.php:

1<?PHP2 classcache{3     //static cache file suffix name4     ConstEXT = ' txt ';5     //defining cache file Storage Paths6     Private $_dir;7      Public function__construct () {8         $this->_dir =dirname(__file__).‘ /files/';9     }Ten  One      Public functionCacheData ($k,$v= ",$cacheTime= 0) {//default permanent not invalidated A //File name -         $filename=$this->_dir.$k.‘.‘. Self::EXT; -         //$v not for ': Store cache or delete cache the         if($v!== "){ -             //Delete Cache -             if(Is_null($v)){ -                 return@unlink($filename); +             } -             //Storage Cache +             $dir=dirname($filename); A             if(!Is_dir($dir)){ at                 mkdir($dir, 0777); -             } -             $cacheTime=sprintf('%011d ',$cacheTime);//$cacheTime set to 11 bits (for easy interception), less than 11 bits in front of 0 - //The cache time stitching $v -             return file_put_contents($filename,$cacheTime. Json_encode ($v)); -         } in         //Read Cache -         if(!Is_file($filename)){ to             return false; +         } -         $contents=file_get_contents($filename); the         $cacheTime= (int)substr($contents, 0,11); *         $val=substr($contents, 11); $         if($cacheTime! = 0 &&$cacheTime+Filemtime($filename) < Time()){//Cache has expiredPanax Notoginseng             unlink($filename); -             return false; the         } +         returnJson_decode ($val,true); A     } the}

View Code

Reference:

Study notes on the sprintf () function in PHP

PHP Development App Interface Learning notes and summary-app interface example [3] Home App interface Development ② Read cache mode