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shortURL for PHP

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Create short url easy by modifying integer to characters

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  1. /**
  2.  * CodeIgniter ShortURL Library
  3.  *
  4.  * Create and Translate ShortURL from integer ID 
  5.  *
  6.  * @location    Application/libraries
  7.  * @package     CodeIgniter
  8.  * @author      Khalid Adisendjaja < [email protected] > 
  9.  * @website		http://khalidadisendjaja.web.id
  10.  */
  11.  
  12. Class Shorturl {
  13.  
  14.   protected $codeset = "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";
  15.   protected $prefix;
  16.  
  17. 	function __construct(){}
  18.  
  19. 	public function setPrefix($p)
  20. 	{
  21. 	 $this->prefix = $p;
  22. 	}
  23.  
  24. 	public function createURL($base_url,$id)
  25. 	{
  26. 	  return $base_url.$this->intToKeyword($id);
  27. 	}
  28.  
  29. 	public function getURL($base_redirect_url,$keyword)
  30. 	{
  31. 	  if($id = $this->keywordToInt($keyword)){
  32. 		return $base_redirect_url.$id;
  33. 	  }else{
  34. 	    return null;
  35. 	  }
  36. 	}
  37.  
  38. 	public function intToKeyword($url_id)
  39. 	{
  40. 		$base = strlen($this->codeset);
  41. 		$n = $url_id;
  42. 		$converted = "";
  43. 		while ($n > 0) {
  44. 		  $converted = substr($this->codeset, ($n % $base), 1) . $converted;
  45. 		  $n = floor($n/$base);
  46. 		}
  47. 		return $this->prefix ? $this->prefix.$converted : $converted;
  48. 	}
  49.  
  50. 	public function keywordToInt($keyword)
  51. 	{  
  52. 	  if($this->prefix){
  53. 		  if(preg_match('/^'.$this->prefix.'([0-9a-zA-Z]+)$/',$keyword,$matches)){
  54. 			 $keyword = $matches[1];
  55. 		   }else{
  56. 			return null;
  57. 		   }
  58. 	  }
  59. 		$base = strlen($this->codeset);
  60. 		$converted = $keyword;
  61. 		$c = 0;
  62. 		for ($i = strlen($converted); $i; $i--) {
  63. 		  $c += strpos($this->codeset, substr($converted, (-1 * ( $i - strlen($converted) )),1)) * pow($base,$i-1);
  64. 		}
  65. 		return $c;
  66. 	}
  67.  
  68. }

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