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<?php var_dump((new \DateTime($row->timestamp))->format('U.u'));
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/lXCZ7
function name:  (null)
number of ops:  12
compiled vars:  !0 = $row
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   INIT_FCALL                                               'var_dump'
          1        NEW                                              $1      'DateTime'
          2        CHECK_FUNC_ARG                                           
          3        FETCH_OBJ_FUNC_ARG                               $2      !0, 'timestamp'
          4        SEND_FUNC_ARG                                            $2
          5        DO_FCALL                                      0          
          6        INIT_METHOD_CALL                                         $1, 'format'
          7        SEND_VAL_EX                                              'U.u'
          8        DO_FCALL                                      0  $4      
          9        SEND_VAR                                                 $4
         10        DO_ICALL                                                 
         11      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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