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<?php date_default_timezone_set('Asia/Tokyo'); // you are required to set a timezone $date1 = new DateTime('2013-03-01'); $date2 = new DateTime('2013-04-01'); $diff = $date1->diff($date2); echo (($diff->format('%y') * 12) + $diff->format('%m')) . " full months difference";
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/WkRdl
function name:  (null)
number of ops:  26
compiled vars:  !0 = $date1, !1 = $date2, !2 = $diff
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   INIT_FCALL                                               'date_default_timezone_set'
          1        SEND_VAL                                                 'Asia%2FTokyo'
          2        DO_ICALL                                                 
    5     3        NEW                                              $4      'DateTime'
          4        SEND_VAL_EX                                              '2013-03-01'
          5        DO_FCALL                                      0          
          6        ASSIGN                                                   !0, $4
    6     7        NEW                                              $7      'DateTime'
          8        SEND_VAL_EX                                              '2013-04-01'
          9        DO_FCALL                                      0          
         10        ASSIGN                                                   !1, $7
    8    11        INIT_METHOD_CALL                                         !0, 'diff'
         12        SEND_VAR_EX                                              !1
         13        DO_FCALL                                      0  $10     
         14        ASSIGN                                                   !2, $10
   10    15        INIT_METHOD_CALL                                         !2, 'format'
         16        SEND_VAL_EX                                              '%25y'
         17        DO_FCALL                                      0  $12     
         18        MUL                                              ~13     $12, 12
         19        INIT_METHOD_CALL                                         !2, 'format'
         20        SEND_VAL_EX                                              '%25m'
         21        DO_FCALL                                      0  $14     
         22        ADD                                              ~15     ~13, $14
         23        CONCAT                                           ~16     ~15, '+full+months+difference'
         24        ECHO                                                     ~16
         25      > RETURN                                                   1

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