Php decimal to Roman number Conversion

by Mr Me on July 10, 2007 in php, php source code

In many cases, we , php programmers need Roman number display I II III IV etc.

Here is a simple algorithm for that .

 1000, 'CM' =&gt; 900, 'D' =&gt; 500, 'CD' =&gt; 400,
     'C' =&gt; 100, 'XC' =&gt; 90, 'L' =&gt; 50, 'XL' =&gt; 40,
     'X' =&gt; 10, 'IX' =&gt; 9, 'V' =&gt; 5, 'IV' =&gt; 4, 'I' =&gt; 1);

      foreach ($lookup as $roman =&gt; $value)
     {
            // Determine the number of matches
             $matches = intval($n / $value);

             // Store that many characters
            $result .= str_repeat($roman, $matches);

            // Substract that from the number
            $n = $n % $value;
      }

      // The Roman numeral should be built, return it
      return $result;
}

?&gt;

1000, 'CM' => 900, 'D' => 500, 'CD' => 400,

'C' => 100, 'XC' => 90, 'L' => 50, 'XL' => 40,

'X' => 10, 'IX' => 9, 'V' => 5, 'IV' => 4, 'I' => 1);

foreach ($lookup as $roman => $value)

{

// Determine the number of matches

$matches = intval($n / $value);

// Store that many characters

$result .= str_repeat($roman, $matches);

// Substract that from the number

$n = $n % $value;

}

// The Roman numeral should be built, return it

return $result;

}

11 Comments

11 Responses to “Php decimal to Roman number Conversion”

Geoserv April 18, 2008 at 11:57 pm #

STUMBLED!

Sweet, good post.

VOTED for you at:
http://www.newsdots.com/tutorials/php-decimal-to-roman-number-conversion-programming-ideas-logics-tips-and-tricks-sajithmr-com/

Reply
NasirJumani April 20, 2008 at 7:35 pm #

Cute little trick, stumbled!

Reply
alex May 26, 2008 at 3:50 am #

Also doesn’t really work:
9 will come out as viiii instead of ix.

Reply
Sajith M.R May 26, 2008 at 12:39 pm #

@Alex
That might be your mistake. I tried 9 and i got IX as output.
The function is right.

Regards
Sajith

Reply
alex May 26, 2008 at 3:06 pm #

Oh yes, you’re right, good shout, didn’t read it properly first time.

Reply
Djordje June 11, 2008 at 5:38 pm #

“private” modifier is useless outside of a class

http://www.free-circuit-diagrams.com

Reply
JonsJava April 22, 2009 at 12:44 am #

Nice to see you steal stuff from other websites. Too bad you forgot to copy and paste the whole thing.

http://www.go4expert.com/forums/showthread.php?t=4948

Reply
Borellus June 28, 2009 at 4:11 pm #

Nice little function there, I think I may try to use it at some point.

Reply
Hello July 20, 2009 at 9:18 pm #

What happens with 10000?

Reply
rean January 5, 2010 at 11:06 am #

nice code…

Reply
rean January 5, 2010 at 11:08 am #

what are the uses of this $lookup as $roman => $value…

Reply