fintara · August 29, 2015 13:55 · Jan 30, 2014 · Jan 30, 2014
diff --git a/DecimalToRoman.php b/DecimalToRoman.php
@@ -3,8 +3,8 @@
  * Converts decimal numbers to Roman numerials.
  * Limit [1; 3999]
  * 
- * @param integer $n
- * @param bool $recursive
+ * @param  integer $n
+ * @param  bool $recursive
  * @return string
  */
 function decroman($n, $recursive = false) {

diff --git a/DecimalToRoman.php b/DecimalToRoman.php
@@ -0,0 +1,57 @@
+<?php
+/**
+ * Converts decimal numbers to Roman numerials.
+ * Limit [1; 3999]
+ * 
+ * @param integer $n
+ * @param bool $recursive
+ * @return string
+ */
+function decroman($n, $recursive = false) {
+    if( !($n > 0 && $n < 4000))
+        return;
+
+    $roman = array(
+        1    => 'I',
+        4    => 'IV',
+        5    => 'V',
+        9    => 'IX',
+        10   => 'X',
+        40   => 'XL',
+        50   => 'L',
+        90   => 'XC',
+        100  => 'C',
+        400  => 'CD',
+        500  => 'D',
+        900  => 'CM',
+        1000 => 'M',
+    );
+
+    if(array_key_exists($n, $roman))
+        return $roman[$n];
+
+    if($n < 10 || $n % 10 === 0 || $n % 100 === 0 || $n % 1000 === 0) {
+        for($m = 1; $m <= 1000; $m *= 10) {
+            for($i = 2; $i < 4; $i++)
+                if($n / $m === $i)
+                    return str_repeat($roman[$n / $i], $i);
+
+            for($i = 6; $i < 9; $i++)
+                if($n / $m === $i)
+                    return $roman[$n - abs($i - 5) * $m] . decrom($n / $i * ($i - 5));
+        }
+    }
+
+    if(!$recursive) {
+        $roman = array();
+        $roman = '';
+        $ten = 1;
+        do {
+            $roman[] = decrom(($n % 10) * $ten, true);
+            $n = (int) ($n / 10);
+            $ten = $ten * 10;
+        } while ($n > 0);
+
+        return implode('', array_reverse($roman));
+    }
+}