From 46c252a44e07a93009a3a9085997857a760747ec Mon Sep 17 00:00:00 2001
From: sc0Vu <alk03073135@gmail.com>
Date: Sun, 24 Dec 2017 23:42:46 +0800
Subject: [PATCH] toEther

---
 src/Utils.php           | 20 +++++++++++++++++++-
 test/unit/UtilsTest.php | 33 +++++++++++++++++++++++++++++++++
 2 files changed, 52 insertions(+), 1 deletion(-)

diff --git a/src/Utils.php b/src/Utils.php
index 5320fcc..387656f 100644
--- a/src/Utils.php
+++ b/src/Utils.php
@@ -163,7 +163,7 @@ class Utils
      * 
      * @param BigNumber|string|int $number
      * @param string $unit
-     * @return string
+     * @return \phpseclib\Math\BigInteger
      */
     public static function toWei($number, $unit)
     {
@@ -187,4 +187,22 @@ class Utils
 
         return $bn->multiply($bnt);
     }
+
+    /**
+     * toEther
+     * 
+     * @param BigNumber|string|int $number
+     * @param string $unit
+     * @return array
+     */
+    public static function toEther($number, $unit)
+    {
+        if ($unit === 'ether') {
+            throw new InvalidArgumentException('Please use another unit.');
+        }
+        $wei = self::toWei($number, $unit);
+        $bnt = new BigNumber(self::UNITS['ether']);
+
+        return $wei->divide($bnt);
+    }
 }
\ No newline at end of file
diff --git a/test/unit/UtilsTest.php b/test/unit/UtilsTest.php
index 01e72ff..3b49dde 100644
--- a/test/unit/UtilsTest.php
+++ b/test/unit/UtilsTest.php
@@ -138,4 +138,37 @@ class UtilsTest extends TestCase
 
         $this->assertEquals($bn->toString(), '21016');
     }
+
+    /**
+     * testToEther
+     * 
+     * @return void
+     */
+    public function testToEther()
+    {
+        list($bnq, $bnr) = Utils::toEther('0x1', 'wei');
+
+        $this->assertEquals($bnq->toString(), '0');
+        $this->assertEquals($bnr->toString(), '1');
+
+        list($bnq, $bnr) = Utils::toEther('1', 'wei');
+
+        $this->assertEquals($bnq->toString(), '0');
+        $this->assertEquals($bnr->toString(), '1');
+
+        list($bnq, $bnr) = Utils::toEther(1, 'wei');
+
+        $this->assertEquals($bnq->toString(), '0');
+        $this->assertEquals($bnr->toString(), '1');
+
+        list($bnq, $bnr) = Utils::toEther('1', 'kether');
+
+        $this->assertEquals($bnq->toString(), '1000');
+        $this->assertEquals($bnr->toString(), '0');
+
+        list($bnq, $bnr) = Utils::toEther('0x5218', 'wei');
+
+        $this->assertEquals($bnq->toString(), '0');
+        $this->assertEquals($bnr->toString(), '21016');
+    }
 }
\ No newline at end of file