PHP

Any web page should use a sitemap.xml, it’s really important for the bots to crawl your site properly.

But how to make it work using PHP?

This is the way I do it for Open Classifieds:

First of all I use to defines, for the path of the file, and when it would expire:

define(SITEMAP_FILE,"sitemap.xml.gz");
define(SITEMAP_EXPIRE,3600); //seconds

At the beginning of any of your scripts we check if the sitempa it’s expired, if it’s expired we generate another time the sitemap :
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Last days I’m working making many changes in Open Classifieds and one of them is this new class to handle the cache.

Few days a go I wrote about a cache class and longer a go about application variables for php. This is a mix of both in just one powerful class.

Explanation:

In this class we have 2 different kinds of cache.

First the normal file cache, where we store values in a single file. This is good for example to cache an entire page.

Second we have an APPLICATION kind integrated in the cache. This means that whatever you store in the APP cache it would be kept in the same file as all the other APP. Really useful to store small amount of data, for example menus, counters etc… Remember that this file is loaded everytime yo create a new object fileCache, you need to be careful to not store many things on it.

The latest version of the class chooses which is the best option of storage engine, based on the size of the variable. Then for example an entire page HTML will be in a single file, and a number or a person name would be in the APP cache.

Usage:

 
$cache = fileCache::GetInstance(30,'cache/');//creating new instance singleton
 
$cache->setDebug(true);//this runs the debug and in destruct prints it
 
//normal usage
$cache->cache('test','test values for the var!!!!');
echo $cache->cache('test');//get
 
//overloads
$cache->anyvar='tes asd asd aasdasdasda sada ast';//overload of set and get methods
echo $cache->anyvar;//get overload
var_dump(isset($cache->anyvar));//isset and unset are overloaded
unset($cache->anyvar);
 
//clear
$cache->deleteCache();//deletes all the cache
$cache->deleteCache(60);//deletes any cache older than X seconds

Updated 17 October 2010
The Class: (Download)
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Just another php cache class that you can find in Internet..

The difference? super easy to use ;)

Usage:
Initialize:

$cache = new Cache();

Set expire time (by default 3600 seconds)

$cache = new Cache(15);

Set the path (by default “cache/”)

$cache = new Cache(120,"/any_other_path/");

Read a “Key”:

$value = $cache->get("some_data");

Write a “Key”:

$cache->put("some_data", "some_value");

Full example to cache a query:

$cache = new Cache();
$values = $cache->get($query);//setting values from cache
 
if ($values==false) {	//not value from cache found
	$result=mysql_query($query);
	if (mysql_num_rows($result)>0){//checking if there's more than one result
		while($row = mysql_fetch_assoc($result))  array_push($values, $row);  //feed array
		$cache->put($query, $values);	//save cache			
	}
}		
print_r($values);

The Class:
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As requirement for one project we need it to concatenate PDF files to have just one file as input.

First download in your work space TCPDF and FPDI

Class to concatenate pdf, pdfConcat.php:

require_once("tcpdf/tcpdf.php");
require_once("fpdi/fpdi.php");
 
class concat_pdf extends FPDI {
     var $files = array();
     function setFiles($files) {
          $this->files = $files;
     }
     function concat() {
          foreach($this->files AS $file) {
               $pagecount = $this->setSourceFile($file);
               for ($i = 1; $i <= $pagecount; $i++) {
                    $tplidx = $this->ImportPage($i);
                    $s = $this->getTemplatesize($tplidx);
                    $this->AddPage(’P', array($s['w'], $s['h']));
                    $this->useTemplate($tplidx);
               }
          }
     }
}

Usage:

include_once("pdfConcat.php");
$pdf =& new concat_pdf();
$pdf->setFiles(array("doc.pdf","pauta.pdf", "4bp.pdf", "5bp.pdf"));
$pdf->concat();
$pdf->Output("newpdf.pdf", "I");

After this I recommend to you to keep the file already merged in the server, then you will not need to generate it another time. To do this you can use $pdf->Output(“newpdf.pdf”, “F”); instead.