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<?php var_dump((new \DateTime('+600s'))->format(DateTime::ATOM));
based on NlHgo
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/JFjiB
function name:  (null)
number of ops:  10
compiled vars:  none
line     #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   3     0  E >   INIT_FCALL                                               'var_dump'
         1        NEW                                              $0      :-4
         2        SEND_VAL_EX                                              '%2B600s'
         3        DO_FCALL                                      0          
         4        INIT_METHOD_CALL                                         $0, 'format'
         5        SEND_VAL_EX                                              'Y-m-d%5CTH%3Ai%3AsP'
         6        DO_FCALL                                      0  $2      
         7        SEND_VAR                                                 $2
         8        DO_ICALL                                                 
         9      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 7.3.0