From e6f7a58d3c0e59f5c878f8e0d1920b11b363c972 Mon Sep 17 00:00:00 2001
From: sc0Vu <alk03073135@gmail.com>
Date: Tue, 9 Jan 2018 17:36:03 +0800
Subject: [PATCH] HexFormatter

---
 src/Formatters/HexFormatter.php | 41 +++++++++++++++++++++++++++++++++
 1 file changed, 41 insertions(+)
 create mode 100644 src/Formatters/HexFormatter.php

diff --git a/src/Formatters/HexFormatter.php b/src/Formatters/HexFormatter.php
new file mode 100644
index 0000000..37a7468
--- /dev/null
+++ b/src/Formatters/HexFormatter.php
@@ -0,0 +1,41 @@
+<?php
+
+/**
+ * This file is part of web3.php package.
+ * 
+ * (c) Kuan-Cheng,Lai <alk03073135@gmail.com>
+ * 
+ * @author Peter Lai <alk03073135@gmail.com>
+ * @license MIT
+ */
+
+namespace Web3\Formatters;
+
+use InvalidArgumentException;
+use Web3\Utils;
+use Web3\Formatters\IFormatter;
+use Web3\Formatters\Integer as IntegerFormatter;
+
+class HexFormatter implements IFormatter
+{
+    /**
+     * format
+     * 
+     * @param mixed $value
+     * @return string
+     */
+    public static function format($value)
+    {
+        $value = Utils::toString($value);
+        $value = mb_strtolower($value);
+
+        if (Utils::isZeroPrefixed($value)) {
+            return $value;
+        } elseif (Utils::isHex($value)) {
+            $value = '0x' . $value;
+        } else {
+            $value = Utils::toHex($value, true);
+        }
+        return $value;
+    }
+}
\ No newline at end of file