diff --git a/lib/php/src/protocol/TBinaryProtocol.php b/lib/php/src/protocol/TBinaryProtocol.php
index 4bb0297..2b1384f 100644
--- a/lib/php/src/protocol/TBinaryProtocol.php
+++ b/lib/php/src/protocol/TBinaryProtocol.php
@@ -136,6 +136,12 @@
     return 8;
   }
 
+  public function writeDouble($out, $value) {
+    $data = pack('d', $value);
+    $out->write(strrev($data), 8);
+    return 8;
+  }
+
   public function writeString($out, $value) {
     $len = strlen($value);
     $result = $this->writeI32($out, $len);
@@ -302,6 +308,13 @@
     return 8;
   }
 
+  public function readDouble($in, &$value) {
+    $data = strrev($in->readAll(8));
+    $arr = unpack('d', $data);
+    $value = $arr[1];
+    return 8;
+  }
+
   public function readString($in, &$value) {
     $result = $this->readI32($in, $len);
     $value = $in->readAll($len);
diff --git a/lib/php/src/protocol/TProtocol.php b/lib/php/src/protocol/TProtocol.php
index 855d588..6101f57 100644
--- a/lib/php/src/protocol/TProtocol.php
+++ b/lib/php/src/protocol/TProtocol.php
@@ -89,6 +89,8 @@
 
   public abstract function writeI64($out, $i64);
 
+  public abstract function writeDouble($out, $dub);
+
   public abstract function writeString($out, $str);
 
 
@@ -139,6 +141,8 @@
 
   public abstract function readI64($in, &$i64);
 
+  public abstract function readDouble($in, &$dub);
+
   public abstract function readString($in, &$str);
 
   /**
@@ -160,6 +164,8 @@
       return $this->readI32($in, $i32);
     case TType::I64:
       return $this->readI64($in, $i64);
+    case TType::DOUBLE:
+      return $this->readDouble($in, $dub);
     case TType::STRING:
       return $this->readString($in, $str);
     case TType::STRUCT:
diff --git a/lib/php/src/protocol/TType.php b/lib/php/src/protocol/TType.php
index 6ef0935..aa930ce 100644
--- a/lib/php/src/protocol/TType.php
+++ b/lib/php/src/protocol/TType.php
@@ -15,7 +15,8 @@
   const VOID   = 1;
   const BOOL   = 2;
   const BYTE   = 3;
-  const I08    = 4;
+  const I08    = 3;
+  const DOUBLE = 4;
   const I16    = 6;
   const I32    = 8;
   const I64    = 10;