Notice: Use of undefined constant PHP_MAJOR_VERSION

got the same error

http://php.net/manual/en/reserved.constants.php#reserved.constants.core
PHP_MAJOR_VERSION Available since PHP 5.2.7
PHP_MINOR_VERSION Available since PHP 5.2.7

https://drupal.org/requirements
Drupal 7: PHP 5.2.5 or higher

before using the php constant there should be a check
if (defined('PHP_MAJOR_VERSION'))

Attached is a patch that should fix this warning. Here, I check whether or not PHP_MAJOR_VERSION is defined. If its not, we can definitely conclude that PHP version < 5.4

Works for me.

Well actually it only worked as I used that path while using PHP 5.3.x but when tested on PHP 5.2.6 it produces another warning, because it falls back into the first if statement and uses json_encode with 2 parameters - which produces notice on PHP version lower than 5.2.7.

-  if(PHP_MAJOR_VERSION >= 5 && PHP_MINOR_VERSION >= 3) {
+  if(!defined('PHP_MAJOR_VERSION') || !PHP_MAJOR_VERSION >= 5 && PHP_MINOR_VERSION >= 3) {
     $json = json_encode($rows, $bitmask);
     // Encoding features not supported before 5.4.x.
     if(PHP_MINOR_VERSION <= 4) {

That should be changed to this:

if(defined('PHP_MAJOR_VERSION') && !PHP_MAJOR_VERSION >= 5 && PHP_MINOR_VERSION >= 3) {

Did a bit of reformatting and committed the change to this:

  if(defined('PHP_MAJOR_VERSION') && PHP_MAJOR_VERSION >= 5 && PHP_MINOR_VERSION >= 3) {