<?
/**

class.cacher.php -- Class used to cache a variable in serialized form.

Written by Serge Stepanov (serge_AT_gfxcafe.com).
Feel free to email me with questions. If you find this useful, would be great to hear from you.

version 1.0 -

Changes:
- First release.

Notes:
- Get() method will only use
the first occurrence, after which
the loop will be broken.

Example:

include("class.cacher.php");

$cache = new Cacher;
// Get var if not 60 seconds old
$variable = $cache->Get("variable_with_id", 60);

if (!$variable) {
// Cache file expired or is inexistant
// Do something to get new data
$cache->Set("variable_with_id", $newdata);
$variable = $newdata;
}

echo $variable;
**/

class Cacher {
// Where things are cached to (must have trailing slash!)
var $cacheDir = "/tmp/";
// How long to cache something for in seconds, default 1hr
var $defaultCacheLife = "3600";

/**
Set($varId, $varValue) --
Creates a file named "cache.VARID.TIMESTAMP"
and fills it with the serialized value from $varValue.
If a cache file with the same varId exists, Delete()
will remove it.
**/
function Set($varId, $varValue) {
// Clean up old caches with same varId
$this->Delete($varId);
// Create new file
$fileHandler = fopen($this->cacheDir . "cache." . $varId . "." . time(), "a");
// Write serialized data
fwrite($fileHandler, serialize($varValue));
fclose($fileHandler);
}

/**
Get($varID, $cacheLife) --
Retrives the value inside a cache file
specified by $varID if the expiration time
(specified by $cacheLife) is not over.
If expired, returns FALSE
**/
function Get($varId, $cacheLife="") {
// Set default cache life
$cacheLife = (!empty($cacheLife)) ? $cacheLife : $this->defaultCacheLife;

/* Loop through the directory looking for cache file */
$dirHandler = dir($this->cacheDir);
while ($file = $dirHandler->read()) {
/* Check for cache file with requested varId */
if (preg_match("/cache.$varId.[0-9]/", $file)) {
$cacheFileName = explode(".", $file);
// Cache file creation time
$cacheFileLife = $cacheFileName[2];
// Full location
$cacheFile = $this->cacheDir . $file;

/* Check to see if cache file has expired or not */
if ((time() - $cacheFileLife) < $cacheLife) {
$fileHandler = fopen($cacheFile, "r");
$varValueResult = fread($fileHandler, filesize($cacheFile));
fclose($fileHandler);
// Still good, return unseralized data
return unserialize($varValueResult);
} else {
// Cache expired, break loop
break;
}
}
}
$dirHandler->close();
return FALSE;
}

/**
Delete($varId) --
Loops through the cache directory and
removes any cache files with the varId
specified in $varID
**/
function Delete($varId) {
$dirHandler = dir($this->cacheDir);
while ($file = $dirHandler->read()) {
if (preg_match("/cache.$varId.[0-9]/", $file)) {
unlink($this->cacheDir . $file); // Delete cache file
}
}
$dirHandler->close();
}

}

?>

$stats_html = "";

require("sources/lib/class.cacher.php");

$cache = new Cacher;
$variable1 = $cache->Get('stat1', 180); // 180 -> 3 min
if (!$variable1) {

 if ($stats_html != "")
 {
  $this->output .= $this->html->stats_header();
  $this->output .= $stats_html;
  $this->output .= $this->html->stats_footer();
 }

 if ($stataffiche != "")
 {
  $this->output .= $this->html->stats_header();
  //$this->output .= $stats_html;
  $this->output .= $stataffiche;
  $this->output .= $this->html->stats_footer();
 }

   $cache->Set('stat1', $stats_html);
   $variable1 = $stats_html;
}
$stataffiche =  $variable1;

require_once("mainfile.php");

require("../forum/sources/lib/class.cacher.php");

$numberofposters = 5;

$query = $DB->query( "SELECT * FROM ibf_members WHERE `posts` > 0 ORDER BY `posts` DESC LIMIT 0,".$numberofposters);

$rating = 0;

$data = "<table>";
while( $row = $DB->fetch_row($query) ) {
$rating++;
$data.=top_posters_row($row+array("rating"=>$rating));
}
$data .="</table>";

function top_posters_row($posterdata) {
global $ibforums;
$buildrow = "<tr>";
$buildrow .="<td class='forum2' width='80%'>{$posterdata['rating']}. <a href='{$ibforums->vars['board_url']}/index.{$ibforums->vars['php_ext']}?s={$ibforums->session_id}&act=Profile&CODE=03&MID={$posterdata['id']}'>{$posterdata['name']}</a></td>";
$buildrow .="<td class='forum2' width='20%' align='right'>{$posterdata['posts']}</td>";
$buildrow .="</tr>";
return $buildrow;
}

$cache = new Cacher;
$variable = $cache->Get('topmes1', 3600);

if (!$variable) {
// Cache file expired or is inexistant
// Do something to get new data
$numberofposters = 5;

$query = $DB->query( "SELECT * FROM ibf_members WHERE `posts` > 0 ORDER BY `posts` DESC LIMIT 0,".$numberofposters);

$rating = 0;
$newdata = "<table>";
while( $row = $DB->fetch_row($query) ) {
$rating++;
$newdata.=top_posters_row($row+array("rating"=>$rating));
}
$newdata .="</table>";
$cache->Set('topmes1', $newdata);
$variable = $newdata;
}
else {
$variable= "<!-- Cache -->".$variable."<!-- /Cache -->";
}
$data = $variable;

function top_posters_row($posterdata) {
global $ibforums;
$buildrow = "<tr>";
$buildrow .="<td class='forum2' width='80%'>{$posterdata['rating']}. <a href='{$ibforums->vars['board_url']}/index.{$ibforums->vars['php_ext']}?s={$ibforums->session_id}&act=Profile&CODE=03&MID={$posterdata['id']}'>{$posterdata['name']}</a></td>";
$buildrow .="<td class='forum2' width='20%' align='right'>{$posterdata['posts']}</td>";
$buildrow .="</tr>";
return $buildrow;
}