Thursday, January 20, 2011

10:33 AM
1
The most well known online website popularity measuring stick appears to be Alexa. Alexa provides a wealth of information on a given website, most notably:

  • Popularity rank (the most important one)
  • Reach
  • In-links
  • Speed
Alexa provides this information in many useful formats, including XML. Using the XML provided by Alexa, we can gain access to Alexa information within our pages. I've created a PHP class to make fetching Alexa data free, quick, and easy. The class comes in a PHP4 version and a PHP5 version.

The Code - PHP4 Version


/* the alexa rank class */
class alexa
{
/* initial vars */
var $xml;
var $values;
var $alexa_address;

/* the constructor */
function alexa($alexa_address,$domain)
{
$this->alexa_address = $alexa_address;
$this->xml = $this->get_data($domain);
$this->set();
}

/* gets the xml data from Alexa */
function get_data($domain)
{
$url = $this->alexa_address.'http://'.$domain;
$xml = file_get_contents($url);
return $xml;
}

/* set values in the XML that we want */
function set()
{
$this->values['rank'] = (preg_match('/POPULARITY URL="[a-z0-9\\-\\.\\/]{1,}" TEXT="([0-9]{1,12})"/',$this->xml,$regs) ? number_format($regs[1]) : 0);
$this->values['reach'] = (preg_match('/REACH RANK="([0-9]{1,12})"/',$this->xml,$regs) ? number_format($regs[1]) : 0);
$this->values['linksin'] = (preg_match('/LINKSIN NUM="([0-9]{1,12})"/',$this->xml,$regs) ? number_format($regs[1]) : 0);
}

/* returns the requested value */
function get($value)
{
return (isset($this->values[$value]) ? $this->values[$value] : '"'.$value.'" does not exist.');
}
}



The Code - PHP5 Version


/* the alexa rank class */
class alexa
{
/* initial vars */
var $xml;
var $values;
var $alexa_address;

/* the constructor */
function alexa($alexa_address,$domain)
{
$this->alexa_address = $alexa_address;
$this->xml = $this->get_data($domain);
$this->set();
}

/* gets the xml data from Alexa */
function get_data($domain)
{
$url = $this->alexa_address.'http://'.$domain;
$xml = simplexml_load_file($url) or die('Cannot retrieve feed');
return $xml;
}

/* set values in the XML that we want */
function set()
{
$this->values['rank'] = ($this->xml->SD->POPULARITY['TEXT'] ? number_format($this->xml->SD->POPULARITY['TEXT']) : 0);
$this->values['reach'] = ($this->xml->SD->REACH['RANK'] ? number_format($this->xml->SD->REACH['RANK']) : 0);
$this->values['linksin'] = ($this->xml->SD->LINKSIN['NUM'] ? number_format($this->xml->SD->LINKSIN['NUM']) : 0);
}

/* returns the requested value */
function get($value)
{
return (isset($this->values[$value]) ? $this->values[$value] : '"'.$value.'" does not exist.');
}
}


Using cURL


If you'd rather use the cURL library, you can simply modify the get_data() function:
/* gets the XML data from Alexa */
function get_data($domain)
{
$url = $this->alexa_address.'http://'.$domain;
$ch = curl_init();
$timeout = 5;
curl_setopt($ch,CURLOPT_URL,$url);
curl_setopt($ch,CURLOPT_RETURNTRANSFER,1);
curl_setopt($ch,CURLOPT_CONNECTTIMEOUT,$timeout);
$xml = curl_exec($ch);
curl_close($ch);
return $xml;
}


The Usage


Provide two paramenters: the path to the XML file (minus the domain) and the domain.
/* retrieve & display rank */
$alexa_connector = new alexa('http://alexa.com/xml/dad?url=','digg.com'); // domain only!
echo 'Rank :: '.$alexa_connector->get('rank'); 
echo '';
echo 'Reach :: '.$alexa_connector->get('reach'); 
echo '';
echo 'Links In :: '.$alexa_connector->get('linksin'); 

Do you have any suggestions for this class?

1 comments:

Abhimanyu Sharma said...

Have you made this code working live on any website.?