Streamlining toString() method

src/Rhumsaa/Uuid/Uuid.php

@@ -375,11 +375,20 @@ final class Uuid
      */
     public function toString()
     {
-        return ($this->digits($this->getMostSignificantBits() >> 32, 8) . '-' .
-            $this->digits($this->getMostSignificantBits() >> 16, 4) . '-' .
-            $this->digits($this->getMostSignificantBits(), 4) . '-' .
-            $this->digits($this->getLeastSignificantBits() >> 48, 4) . '-' .
-            $this->digits($this->getLeastSignificantBits(), 12));
+        $hex = sprintf(
+            '%016x%016x',
+            $this->getMostSignificantBits(),
+            $this->getLeastSignificantBits()
+        );
+
+        return sprintf(
+            '%s-%s-%s-%s-%s',
+            substr($hex, 0, 8),
+            substr($hex, 8, 4),
+            substr($hex, 12, 4),
+            substr($hex, 16, 4),
+            substr($hex, 20)
+        );
     }
 
     /**
@@ -522,19 +531,6 @@ final class Uuid
     {
     }
 
-    /**
-     * Returns $value represented by the specified number of hex $digits.
-     *
-     * @param int $value The value to process (in integer form)
-     * @param int $digits The number of hex digits to return
-     * @return string
-     */
-    protected function digits($value, $digits)
-    {
-        $hi = (1 << ($digits * 4));
-        return substr(dechex($hi | ($value & ($hi - 1))), 1);
-    }
-
     /**
      * Get the hardware address as a 48-bit positive integer. If all attempts to
      * obtain the hardware address fail, we choose a random 48-bit number with

tests/Rhumsaa/Uuid/UuidTest.php

@@ -321,7 +321,6 @@ class UuidTest extends \PHPUnit_Framework_TestCase
     /**
      * @covers Rhumsaa\Uuid\Uuid::toString
      * @covers Rhumsaa\Uuid\Uuid::__toString
-     * @covers Rhumsaa\Uuid\Uuid::digits
      */
     public function testToString()
     {