PHP Alexa Rank类 alexa, class, function, initial, domain

php类获取Alexa排名,获取以下相关信息：

人气排名

日访问量

反向链接

响应速度

PHP4版本代码

1. 
   
2. /* the alexa rank class */
   
3. class alexa
   
4. {
   
5. /* initial vars */
   
6. var $xml;
   
7. var $values;
   
8. var $alexa_address;
   
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. /* gets the xml data from Alexa */
    
17. function get_data($domain)
    
18. {
    
19. $url = $this->alexa_address.'http://'.$domain;
    
20. $xml = file_get_contents($url);
    
21. return $xml;
    
22. }
    
23. /* set values in the XML that we want */
    
24. function set()
    
25. {
    
26. $this->values['rank'] = (preg_match('/POPULARITY URL="[a-z0-9\\-\\.\\/]{1,}" TEXT="([0-9]{1,12})"/',$this->xml,$regs) ? number_format($regs[1]) : 0);
    
27. $this->values['reach'] = (preg_match('/REACH RANK="([0-9]{1,12})"/',$this->xml,$regs) ? number_format($regs[1]) : 0);
    
28. $this->values['linksin'] = (preg_match('/LINKSIN NUM="([0-9]{1,12})"/',$this->xml,$regs) ? number_format($regs[1]) : 0);
    
29. }
    
30. /* returns the requested value */
    
31. function get($value)
    
32. {
    
33. return (isset($this->values[$value]) ? $this->values[$value] : '"'.$value.'" does not exist.');
    
34. }
    
35. }

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PHP5版本代码

1. 
   
2. /* the alexa rank class */
   
3. class alexa
   
4. {
   
5. /* initial vars */
   
6. var $xml;
   
7. var $values;
   
8. var $alexa_address;
   
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. /* gets the xml data from Alexa */
    
17. function get_data($domain)
    
18. {
    
19. $url = $this->alexa_address.'http://'.$domain;
    
20. $xml = simplexml_load_file($url) or die('Cannot retrieve feed');
    
21. return $xml;
    
22. }
    
23. /* set values in the XML that we want */
    
24. function set()
    
25. {
    
26. $this->values['rank'] = ($this->xml->SD->POPULARITY['TEXT'] ? number_format($this->xml->SD->POPULARITY['TEXT']) : 0);
    
27. $this->values['reach'] = ($this->xml->SD->REACH['RANK'] ? number_format($this->xml->SD->REACH['RANK']) : 0);
    
28. $this->values['linksin'] = ($this->xml->SD->LINKSIN['NUM'] ? number_format($this->xml->SD->LINKSIN['NUM']) : 0);
    
29. }
    
30. /* returns the requested value */
    
31. function get($value)
    
32. {
    
33. return (isset($this->values[$value]) ? $this->values[$value] : '"'.$value.'" does not exist.');
    
34. }
    
35. }

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使用cURL
如果您使用curl库，你可以简单地修改get_data()函数：

1. 
   
2. /* gets the XML data from Alexa */
   
3. function get_data($domain)
   
4. {
   
5. $url = $this->alexa_address.'http://'.$domain;
   
6. $ch = curl_init();
   
7. $timeout = 5;
   
8. curl_setopt($ch,CURLOPT_URL,$url);
   
9. curl_setopt($ch,CURLOPT_RETURNTRANSFER,1);
   
10. curl_setopt($ch,CURLOPT_CONNECTTIMEOUT,$timeout);
    
11. $xml = curl_exec($ch);
    
12. curl_close($ch);
    
13. return $xml;
    
14. }

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用法：

1. 
   
2. /* retrieve & display rank */
   
3. $alexa_connector = new alexa('http://alexa.com/xml/dad?url=','digg.com'); // domain only!
   
4. echo 'Rank :: '.$alexa_connector->get('rank'); // returns 118
   
5. echo ”;
   
6. echo 'Reach :: '.$alexa_connector->get('reach'); // returns 95
   
7. echo ”;
   
8. echo 'Links In :: '.$alexa_connector->get('linksin'); // returns 34,414

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