PHP

Caching Output

Posted by admin - December 7, 2009

High-traffic sites can often benefit from caching of pages, to save processing of the same data over and over again.

Put the first function cache_start in the beginning of php script and the second cache_end in the end of script.

Code:

function cache_start($_time, $dir)
{
  $cachefile = $dir.'/'.sha1($_SERVER['REQUEST_URI']).'.html';
  $cachetime = $_time;
  ob_start();

  if(file_exists($cachefile) && (time( )-$cachetime < filemtime($cachefile)))
  {
    include($cachefile);
    ob_end_flush();
    exit;
  }
}

//——————————————–

function cache_end($dir)
{
  $cachefile = $dir.'/'.sha1($_SERVER['REQUEST_URI']).'.html';
  $fp = fopen($cachefile, 'w');
  fwrite($fp, ob_get_contents());
  fclose($fp);
  ob_end_flush();
}

//————————————–
$_time : cache time

$dir : directory to cache files

Catching Keywords from Search Engines

Posted by admin - December 2, 2009

With this class we try to catch some keywords from google, yahoo and bing search engines.

Code:

<?php
class keywords
{
 private $referer;
 private $_e;
 public $keywords;

 public function __construct()
 {
   if($_SERVER['HTTP_REFERER'])
   {
     if(preg_match("#\.google|search\.yahoo|\.bing#", $_SERVER['HTTP_REFERER']))
     {
       $this->referer = urldecode($_SERVER['HTTP_REFERER']);
     }
     else
     {
       return;
     }    
   }
   else
   {
     return;
   }    
 }

 private function getSeparators()
 {
   $this->_e = (preg_match("#\?q=|\?p=#", $this->referer)) ? "\?" : "&";
 }

 public function getKeywords()
 {
   if(!empty($this->referer))
   {
     $this->getSeparators();
     //google
     if(preg_match("#\.google#", $this->referer))
     {
       $m_ = preg_match("#{$this->_e}q=(.+?)&#si", $this->referer, $this->keywords);

       if($m_ == 0)
       {
         return false;
       }
     }
     //yahoo
     elseif(preg_match("#search\.yahoo#", $this->referer))
     {
       $m_ = preg_match("#{$this->_e}p=(.+?)\&#si", $this->referer, $this->keywords);

       if($m_ == 0)
       {
         return false;
       }
     }
     //bing
     elseif(preg_match("#\.bing#", $this->referer))
     {
       $m_ = preg_match("#{$this->_e}q=(.+?)\&#si", $this->referer, $this->keywords);

       if($m_ == 0)
       {
         return false;
       }
     }
     else
     {
       return false;
     }

     return $this->keywords[1];
   }
   else
   {
     return false;
   }
  }
}
?>

Save this script as keywords_class.php

Now let’s try to print these keywords.

Code:

<?php
require_once('keywords_class.php');
$keywordsObj = new keywords();
$keys = $keywordsObj->getKeywords();

if($keys)
{
 print $keys;
}
else
{
 print "ooops";
}
?>

Save this code as index.php

Magnet Link

Posted by admin - November 22, 2009

This PHP function return the urn (Uniform Resource Name) formed from the content hash of a particular torrent file. The urn refering to the Base32 encoded hash of the file.

Code:

function base32_encode ($hash)
{
$outString = '';
$compBits = '';
$BASE32_TABLE = array(
                         '00000' => 0x61,
                         '00001' => 0x62,
                         '00010' => 0x63,
                         '00011' => 0x64,
                         '00100' => 0x65,
                         '00101' => 0x66,
                         '00110' => 0x67,
                         '00111' => 0x68,
                         '01000' => 0x69,
                         '01001' => 0x6a,
                         '01010' => 0x6b,
                         '01011' => 0x6c,
                         '01100' => 0x6d,
                         '01101' => 0x6e,
                         '01110' => 0x6f,
                         '01111' => 0x70,
                         '10000' => 0x71,
                         '10001' => 0x72,
                         '10010' => 0x73,
                         '10011' => 0x74,
                         '10100' => 0x75,
                         '10101' => 0x76,
                         '10110' => 0x77,
                         '10111' => 0x78,
                         '11000' => 0x79,
                         '11001' => 0x7a,
                         '11010' => 0x32,
                         '11011' => 0x33,
                         '11100' => 0x34,
                         '11101' => 0x35,
                         '11110' => 0x36,
                         '11111' => 0x37,
                         );

   /* Turn the compressed string into a string that represents the bits as 0 and 1. */
   for ($i = 0; $i < strlen($hash); $i++) {
       $compBits .= str_pad(decbin(ord(substr($hash,$i,1))), 8, '0', STR_PAD_LEFT);
   }

   /* Pad the value with enough 0's to make it a multiple of 5 */
   if((strlen($compBits) % 5) != 0) {
       $compBits = str_pad($compBits, strlen($compBits)+(5-(strlen($compBits)%5)), '0', STR_PAD_RIGHT);
   }

   /* Create an array by chunking it every 5 chars */
   $fiveBitsArray = split("\n",rtrim(chunk_split($compBits, 5, "\n")));

   /* Look-up each chunk and add it to $outstring */
   foreach($fiveBitsArray as $fiveBitsString) {
       $outString .= chr($BASE32_TABLE[$fiveBitsString]);
   }

   return $outString;

Parametres:

dn - Filename

xl - Size in bytes

xt - urn containing file hash

as - Web link to the file online

xs - P2P link

kt - Key words for search

mt - link to the metafile that contains a list of magneto

xt is the most important part of magnet links.

Sites that use this kind of magnet links: btscene.com , mininova.org

Unpack the overLIB library into your web server’s documents directory, add in the index.php file and surf to it on your browser. This popup can be used with images, tables, fonts, styles and whatever you want.

HTML Email

Posted by admin - November 11, 2009

This code describes how to send email using a multipart construction, where one part contains a plain-text version of the email and the other part is HTML. If you customers have HTML email turned off they will still get a nice email even if they don’t get all of the HTML markup.

Code:

 <?php
 $to_nickname = "Jimmy";
 $to = "jimmy@email.com";
 $from_nickname = "Jack";
 $from = "jack@email.com";
 $subject = "HTML Email";

 $random_hash = "2343qwe";

 ob_start();
 ?>
 To: <?=$to_nickname?> < <?=$to?> >
 From: <?=$from_nickname?> < <?=$from?> >
 MIME-Version: 1.0
 Content-Type: multipart/alternative;boundary="==Multipart_Boundary_<?=$random_hash?>"
 <?php
 $headers = ob_get_clean();
 ob_start();
 ?>

This is a multi-part message in MIME format.

--==Multipart_boundary_<?php print "$random_hash\n"; ?>
 Content-Type: text/plain; charset="iso-8859-1"
 Content-Transfer-Encoding: 7bit

This is the text of the message in a simple tetx format.

--==Multipart_boundary_<?=$random_hash?>
 Content-Type: text/html; charset="iso-8859-1"
 Content-Transfer-Encoding: 7bit

<html>
 <body>
 <p>Here is something with HTML formatting. That can include all of the usual:</p>
 <ul>
 <li>Bulleted lists</li>
 <li>Tables</li>
 <li>Images (if you include them as attachments or external links)</li>
 <li>Character formatting</li>
 <li>etc</li>
 </ul>
 </body>
 </html>

--==Multipart_boundary_<?=$random_hash?>

 <?php
 $message = ob_get_clean();
 $mail = @mail($to, $subject, $message, $headers);
 $ok = $mail ? "Mail sent\n" : "Mail failed\n";
 print $ok;
 ?>

The only hitch comes from the images or other file-based resources. You have two alternatives with images. The first is to reference an image on a remote server. There are a couple of problems with this approach. First it doesn’t work for offline mail reading. Second spammers use this mechanism to see whether you have opened their email.

The second approach is to embed the image as an attachment in another part of the multipart message. This will work, but the email message themselves will be larger because of the base-64-encoded images.

Size Image Tags

Posted by admin - October 29, 2009

All of the modern browsers start showing web pages as quickly as possible. This means browsers will start showing a page well before any images or other accompanying resources are downloaded. Because the browser hasn’t downloaded the image before rendering the page, it doesn’t know how big the image should be, unless you specify height and width attributes on the img tag.
If you don’t specify the width and height of images ,though, the page will jerk around as it’s being downloaded. The browser will guess at the size of the image but then find out after the image is downloaded that the actual size is much larger. Thus the browser will need to lay out the page again to adjust for the new size.

Code:

<html>
 <head>
 <title>Image Size</title>
 <?php
 function getImageSize($image)
 {
   list($width, $height) = getimagesize($image);
   print "<img src=\"$image\" width=\"$width\" height=\"$height\" />";
 }
 ?>
 </head>
 <body>
 <?php getImageSize("your_image.png"); ?>
 </body>
 </html>

You can use this function anywhere you would have put an img tag previously, don’t use this function in static headers or footers where the size of the images will never change.

PHP

Dynamic Navigation Menus

Drop-Down Stickies

Section Content with Spinners

Caching Output

Catching Keywords from Search Engines

Drag - Drop Lists

Magnet Link

Pop-Up Hints

HTML Email

Size Image Tags

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