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<?php /** * @see https://community.developer.authorize.net/t5/The-Authorize-Net-Developer-Blog/Precision-Math-with-PHP/ba-p/8368 */ var_dump(floor((0.2 + 1.4) * 10)); // Should be 16. But it's 15! // Using BC Math var_dump(bcadd('0.2', '1.4', 2) * 10); // It's 16 like we would expect it to be.
based on L7uHJ
Finding entry points
Branch analysis from position: 0
Jump found. Position 1 = -2
filename:       /in/1FccM
function name:  (null)
number of ops:  16
compiled vars:  none
line     #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   7     0  E >   INIT_FCALL                                               'var_dump'
         1        INIT_FCALL                                               'floor'
         2        SEND_VAL                                                 16
         3        DO_ICALL                                         $0      
         4        SEND_VAR                                                 $0
         5        DO_ICALL                                                 
  10     6        INIT_FCALL                                               'var_dump'
         7        INIT_FCALL_BY_NAME                                       'bcadd'
         8        SEND_VAL_EX                                              '0.2'
         9        SEND_VAL_EX                                              '1.4'
        10        SEND_VAL_EX                                              2
        11        DO_FCALL                                      0  $2      
        12        MUL                                              ~3      $2, 10
        13        SEND_VAL                                                 ~3
        14        DO_ICALL                                                 
        15      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 7.3.0