PHP Cache Technology (reduces database server stress)

1. Static cache (static files stored on disk, with PHP generated data into static files)

A) PHP operation cache

I. Generating a cache

II. Get the cache

Iii. Deleting a cache

Determine if the directory exists: Is_dir ()

DirName (__file__): You can get the current directory of the file

mkdir (): Create directory

Unlink (): Delete file

<?PHP//Static Cachingclass File{ Constext= ". txt"; Private $_dir;  Public function__construct () {//Default Path       $this->_dir=dirname(__file__).‘ /files/'; }     /** * $key cache filename * $value Cache value * $path cache file Directory **/      Public functionCacheData ($key,$value= ",$path= ' '){        $filename=$this->_dir.$path.$key. Self::EXT; if($value!== ') {//write value values to cache                   if(Is_null($value)){//Delete a cache file              return@unlink($filename); }           $dir=dirname($filename); if(!Is_dir($dir)){             mkdir($dir, 0777);//Create a cache catalog file            }            return file_put_contents($filename, Json_encode ($value)); }            //Get Cache    if(!Is_file($filename)){      return false; }Else{     returnJson_encode (file_get_contents($filename),true); } }}$data=Array(' id ' =>1, ' name ' = ' ann ');//instantiating the file class    $file=New File();//Generate Cache   if($file->cachedata (' Index_cache ',$data))    {     Echo' Success '; }Else{      Echo' Error '; }    //Get Cache/*if ($file->cachedata ("Index_cache")) {Var_dump ($file->cachedata ("Index_cache"));      }else{echo ' ERROR '; } */       //Delete Cache /*if ($file->cachedata (' Index_cache ', null)) {echo ' success ';    } else{echo ' Errors '; }*/?>

2.Memcache Redis Cache

Setting up the cache

Failed to set cache after 15 seconds

To get the cached value:

PHP operation Memcache (see PHP Manual for more)

1. Installing the memcache Extension

2.L Connection Service-connect (' Memcache_host ', 11211);

3.set Set Cache

4. Get Cache

Timed tasks (Linux systems)

Timed Task commands

1. Scheduled Task Service provides crontab command to set the service

2.CRONTAB-E//Edit a user's cron service

3. Crontab-l//list details of a user cron service

4.crontab-r//Delete a user's cron service

PHP Cache Technology (reduces database server stress)