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  1. <?php
  2. /**
  3.  * Base62: A class to convert a number from any base between 2-62 to any other base between 2-62
  4.  * It doesn't use BC Math functions so works without the use of BC Math library.
  5.  * It uses the native base_convert functions when the base is below 36 for faster execution.
  6.  * The output number is backward compatible with the native base_convert function.
  7.  *
  8.  * Author : Lalit Patel
  9.  * Website: http://w...content-available-to-author-only...t.org/lab/base62-php-convert-number-to-base-62-for-short-urls
  10.  * License: Apache License 2.0
  11.  *          http://w...content-available-to-author-only...e.org/licenses/LICENSE-2.0
  12.  * Version: 0.1 (08 December 2011)
  13.  *
  14.  * Usage:
  15.  *       $converted_num = Base62::convert($number, $from_base, $to_base);
  16.  */
  17.  
  18. class Base62 {
  19.     /**
  20.      * Converts a number/string from any base between 2-62 to any other base from 2-62
  21.      * @param mixed $number
  22.      * @param integer $from_base
  23.      * @param integer $to_base
  24.      * @return $conveted_number.
  25.      */
  26.     public static function  convert($number, $from_base=10, $to_base=62) {
  27.         if($to_base > 62 || $to_base < 2) {
  28.             trigger_error("Invalid base (".he($to_base)."). Max base can be 62. Min base can be 2.", E_USER_ERROR);
  29.         }
  30.         //OPTIMIZATION: no need to convert 0
  31.         if("{$number}" === '0') {
  32.             return 0;
  33.         }
  34.  
  35.         //OPTIMIZATION: if to and from base are same.
  36.         if($from_base == $to_base){
  37.             return $number;
  38.         }
  39.  
  40.         //OPTIMIZATION: if base is lower than 36, use PHP internal function
  41.         if($from_base <= 36 && $to_base <= 36) {
  42.             // for lower base, use the default PHP function for faster results
  43.             return base_convert($number, $from_base, $to_base);
  44.         }
  45.  
  46.         // char list starts from 0-9 and then small alphabets and then capital alphabets
  47.         // to make it compatible with eixisting base_convert function
  48.         $charlist = "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";
  49.         if($from_base < $to_base) {
  50.             // if converstion is from lower base to higher base
  51.             // first get the number into decimal and then convert it to higher base from decimal;
  52.  
  53.             if($from_base != 10){
  54.                 $decimal = self::convert($number, $from_base, 10);
  55.             } else {
  56.                 $decimal = intval($number);
  57.             }
  58.  
  59.             //get the list of valid characters
  60.             $charlist = substr($charlist, 0, $to_base);
  61.  
  62.             if($number == 0) {
  63.                 return 0;
  64.             }
  65.             $converted = '';
  66.             while($number > 0) {
  67.                 $converted = $charlist{($number % $to_base)} . $converted;
  68.                 $number = floor($number / $to_base);
  69.             }
  70.             return $converted;
  71.         } else {
  72.             // if conversion is from higher base to lower base;
  73.             // first convert it into decimal and the convert it to lower base with help of same function.
  74.             $number = "{$number}";
  75.             $length = strlen($number);
  76.             $decimal = 0;
  77.             $i = 0;
  78.             while($length > 0) {
  79.                 $char = $number{$length-1};
  80.                 $pos = strpos($charlist, $char);
  81.                 if($pos === false){
  82.                     trigger_error("Invalid character in the input number: ".($char), E_USER_ERROR);
  83.                 }
  84.                 $decimal += $pos * pow($from_base, $i);
  85.                 $length --;
  86.                 $i++;
  87.             }
  88.             return self::convert($decimal, 10, $to_base);
  89.         }
  90.     }
  91. }
  92. echo Base62::convert(100)."\n";
  93. echo Base62::convert(1000)."\n";
  94. echo Base62::convert(10000)."\n";
  95. echo Base62::convert(100000)."\n";
  96. echo Base62::convert(1000000)."\n";
  97. echo Base62::convert(10000000)."\n";
  98. echo Base62::convert(100000000)."\n";
  99. echo Base62::convert(123456789089898)."\n";
  100.  
  101. ?>
  102.  
  103.  
Success #stdin #stdout 0.02s 13064KB
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https://ideone.com/HOwl79
language:
PHP (php 7.3.5)
created:
11 years ago
visibility:
public

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