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<?php $d = '2015-01-01'; $dd = new DateTime($d); print_r($dd->format(DateTime::W3C)); $dd->add(new DateInterval('PT17H12M')); print_r($dd->format(DateTime::W3C)); var_dumpt($dd->format('\P\TH\Hi\M') === 'PT1712M');
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/u33Tf
function name:  (null)
number of ops:  31
compiled vars:  !0 = $d, !1 = $dd
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   ASSIGN                                                   !0, '2015-01-01'
    4     1        NEW                                              $3      'DateTime'
          2        SEND_VAR_EX                                              !0
          3        DO_FCALL                                      0          
          4        ASSIGN                                                   !1, $3
    5     5        INIT_FCALL                                               'print_r'
          6        INIT_METHOD_CALL                                         !1, 'format'
          7        SEND_VAL_EX                                              'Y-m-d%5CTH%3Ai%3AsP'
          8        DO_FCALL                                      0  $6      
          9        SEND_VAR                                                 $6
         10        DO_ICALL                                                 
    7    11        INIT_METHOD_CALL                                         !1, 'add'
         12        NEW                                              $8      'DateInterval'
         13        SEND_VAL_EX                                              'PT17H12M'
         14        DO_FCALL                                      0          
         15        SEND_VAR_NO_REF_EX                                       $8
         16        DO_FCALL                                      0          
    8    17        INIT_FCALL                                               'print_r'
         18        INIT_METHOD_CALL                                         !1, 'format'
         19        SEND_VAL_EX                                              'Y-m-d%5CTH%3Ai%3AsP'
         20        DO_FCALL                                      0  $11     
         21        SEND_VAR                                                 $11
         22        DO_ICALL                                                 
   10    23        INIT_FCALL_BY_NAME                                       'var_dumpt'
         24        INIT_METHOD_CALL                                         !1, 'format'
         25        SEND_VAL_EX                                              '%5CP%5CTH%5CHi%5CM'
         26        DO_FCALL                                      0  $13     
         27        IS_IDENTICAL                                     ~14     $13, 'PT1712M'
         28        SEND_VAL_EX                                              ~14
         29        DO_FCALL                                      0          
         30      > RETURN                                                   1

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