[프로그래밍] PHP Alexa Rank Fetcher Class

PHP Alexa Rank Fetcher Class

The most popular 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

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1. /* the alexa rank class */  


2. class alexa   


3. {   


4.     /* initial vars */  


5.     var $xml;   


6.     var $values;   


7.     var $alexa_address;   


8.   


9.     /* the constructor */  


10.     function alexa($alexa_address,$domain)   


11.     {   


12.         $this->alexa_address = $alexa_address;   


13.         $this->xml = $this->get_data($domain);   


14.         $this->set();   


15.     }   


16.   


17.     /* gets the xml data from Alexa */  


18.     function get_data($domain)   


19.     {   


20.         $url = $this->alexa_address.'http://'.$domain;   


21.         $xml = file_get_contents($url);   


22.         return $xml;   


23.     }   


24.   


25.     /* set values in the XML that we want */  


26.     function set()   


27.     {   


28.         $this->values['rank'] = (preg_match('/POPULARITY URL="[a-z0-9-./]{1,}" TEXT="([0-9]{1,12})"/',$this->xml,$regs) ? number_format($regs[1]) : 0);   


29.         $this->values['reach'] = (preg_match('/REACH RANK="([0-9]{1,12})"/',$this->xml,$regs) ? number_format($regs[1]) : 0);   


30.         $this->values['linksin'] = (preg_match('/LINKSIN NUM="([0-9]{1,12})"/',$this->xml,$regs) ? number_format($regs[1]) : 0);   


31.     }   


32.   


33.     /* returns the requested value */  


34.     function get($value)   


35.     {   


36.         return (isset($this->values[$value]) ? $this->values[$value] : '"'.$value.'" does not exist.');   


37.     }   


38. }  

/* 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

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1. /* the alexa rank class */  


2. class alexa   


3. {   


4.     /* initial vars */  


5.     var $xml;   


6.     var $values;   


7.     var $alexa_address;   


8.   


9.     /* the constructor */  


10.     function alexa($alexa_address,$domain)   


11.     {   


12.         $this->alexa_address = $alexa_address;   


13.         $this->xml = $this->get_data($domain);   


14.         $this->set();   


15.     }   


16.   


17.     /* gets the xml data from Alexa */  


18.     function get_data($domain)   


19.     {   


20.         $url = $this->alexa_address.'http://'.$domain;   


21.         $xml = simplexml_load_file($url) or die('Cannot retrieve feed');   


22.         return $xml;   


23.     }   


24.   


25.     /* set values in the XML that we want */  


26.     function set()   


27.     {   


28.         $this->values['rank'] = ($this->xml->SD->POPULARITY['TEXT'] ? number_format($this->xml->SD->POPULARITY['TEXT']) : 0);   


29.         $this->values['reach'] = ($this->xml->SD->REACH['RANK'] ? number_format($this->xml->SD->REACH['RANK']) : 0);   


30.         $this->values['linksin'] = ($this->xml->SD->LINKSIN['NUM'] ? number_format($this->xml->SD->LINKSIN['NUM']) : 0);   


31.     }   


32.   


33.     /* returns the requested value */  


34.     function get($value)   


35.     {   


36.         return (isset($this->values[$value]) ? $this->values[$value] : '"'.$value.'" does not exist.');   


37.     }   


38. }  

/* 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:

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1. /* gets the xml data from Alexa */  


2. function get_data($domain)   


3. {   


4.     $url = $this->alexa_address.'http://'.$domain;   


5.     $ch = curl_init();   


6.     $timeout = 5;   


7.     curl_setopt($ch,CURLOPT_URL,$url);   


8.     curl_setopt($ch,CURLOPT_RETURNTRANSFER,1);   


9.     curl_setopt($ch,CURLOPT_CONNECTTIMEOUT,$timeout);   


10.     $xml = curl_exec($ch);   


11.     curl_close($ch);   


12.     return $xml;   


13. }  

/* 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.

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1. /* retrieve & display rank */  


2. $alexa_connector = new alexa('http://alexa.com/xml/dad?url=','digg.com'); // domain only!   


3. echo 'Rank :: '.$alexa_connector->get('rank'); // returns 118   


4. echo '';   


5. echo 'Reach :: '.$alexa_connector->get('reach'); // returns 95   


6. echo '';   


7. echo 'Links In :: '.$alexa_connector->get('linksin'); // returns 34,414