Description:
------------
The string sorting output for the next program is wrong (just for 0 case, for any other number rather than 0, it works). 

Reproduce code:
---------------
<?php

$arr_test = array();

array_push($arr_test, '0');
array_push($arr_test, '0.0');

sort($arr_test);

foreach($arr_test as $test){
  print $test . "|";
}


?>

Expected result:
----------------
0|0.0

Actual result:
--------------
0.0|0