PHP file Cache Implementation program code

Principle of File Caching

1. The data that needs to be cached is serialized through the Serialize function and saved directly to the file. When you need to use cached data, read the contents of the file and copy it to the desired variable by deserializing it, and then use the. Data that is infrequently changed can be written to a cached file.

File Cache Instance

index.php

The code is as follows

Copy Code

Define (' Cache_root ', './'); Include_once ('./cache.func.php '); $file = ' Qzp '; $cacheFile = Getcachefilebyid ($file, ' info/'); Print_r (Readcache ($cacheFile)); $info = Array ( ' username ' => ' qzp ', ' Area_name ' => ' admin ', ' Mp_name ' => ' 1234 ', ' Gh_name ' => ' 5678 '); Writecache ($cacheFile, $info); cache.func.php file function Arrayeval ($array, $level = 0) { $space = '; for ($i = 0; $i <= $level; $i + +) { $space. = "T"; } $evaluate = "Arrayn$space (n"); $comma = $space; foreach ($array as $key => $val) { $key = is_string ($key)? "Addcslashes ($key, ' \ ').": $key; $val =!is_array ($val) && (!preg_match ("/^-?[ 1-9]d*$/", $val) | | strlen ($val) > 12)? "Addcslashes ($val, ' \ ').": $val; if (Is_array ($val)) { $evaluate. = "$comma $key =>". Arrayeval ($val, $level + 1); } else { $evaluate. = "$comma $key => $val"; } $comma = ", n$space"; } $evaluate. = "N$space)"; return $evaluate; } function Getcachefilebyid ($id, $pre = ' info/', $md 5=true) { if ($MD 5) { $MD 5id = MD5 ($id); return cache_root. ' /'. $pre. substr ($md 5id,0,2). ' /'. substr ($md 5id,2,2). ' /'. $id; }else{ return cache_root. ' /'. $pre. $id; } } function Readcache ($filename, $time =0) { if ($datas = @file_get_contents ($filename)) { $datas = Unserialize ($datas); if ($time < 1 | | (Time ()-$datas [' Time '] < $time)) { return $datas [' data ']; } } return false; } function Writecache ($filename, $data) { MakeDir (DirName ($filename)); if ($handle = fopen ($filename, ' w+ ')) { $datas = Array (' Data ' => $data, ' time ' =>time ()); Flock ($handle, LOCK_EX); $rs = fputs ($handle, serialize ($datas)); Flock ($handle, lock_un); Fclose ($handle); if ($rs!==false) { return true; } } return false; } function MakeDir ($path) { if (! file_exists ($path)) { MakeDir (DirName ($path)); if (! mkdir ($path, 0777)) Die (' Unable to create folder '. $path); } }

Store the files to be cached and use them to deserialize them when used.

Use a tool that caches PHP template data to Smarty. Smarty the HTML file into a static HTML page, you need to cache the template file to use Smarty.
Cases:

code is as follows	copy code
<?php ///contains Smarty class library require (' libs/smarty.class.php ');   //Create object for Smarty class $smarty = new Smarty; & nbsp //Enable caching $smarty->caching = true;   //Specify directory for cache file Save $smarty->cache_dir = "./cache/"; & nbsp //will also save the output $smarty->display (' index.tpl ')