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  1. <?php
  2. function decToBase($num, $stem = null){
  3.  
  4. 	$newBase = strlen($stem);
  5. 	$out = '';
  6. 	while($num > 0){
  7. 		$devide = $num/$newBase;
  8. 		$result = floor($devide);
  9. 		$remind = $devide - $result;
  10. 		$num = $result;
  11. 		$out = substr($stem, round($remind * $newBase),1).$out;
  12. 	}
  13. 	return $out;
  14. }
  15.  
  16. /**
  17.      *
  18.      * @param string $num The input base number as string
  19.      * @param string $stem a unique characters string which its length is the base
  20.      * @return integer the number in decimal base 10
  21.      */
  22.  
  23.     function baseToDec($num, $stem = null){
  24.  
  25.         $n = strlen($num);
  26.         $b = strlen($stem);
  27.         $out = 0;
  28.         for ($i =0; $i < strlen($num); $i++){
  29.             $n--;
  30.             $out = $out + (strpos($stem,$num[$i])*($b**$n));               
  31.           }
  32.         return $out;
  33.     }
  34.     $stem = '0123456789ABCDEFGHIJKLMNOPUQRSTVWXYZabcdefghijklmnopqurstvwxyz~[]{}:.;!@#$%^&*()_-+=/';
  35.     $i = baseToDec('Facebook.com',$stem);
  36.     echo $i.'   '.decToBase($i,$stem);
  37. // your code goes here
Success #stdin #stdout 0.02s 25464KB
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2.5819146054455E+22   Facebook]000
https://ideone.com/ZyXJdb
language:
PHP (php 7.3.5)
created:
4 years ago
visibility:
public

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