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<?php $a = new DateTime('2017-11-01 13:24:52', new \DateTimeZone('Europe/Berlin')); echo $a->format(DATE_ISO8601);
based on ishQQ
Finding entry points
Branch analysis from position: 0
Jump found. (Code = 62) Position 1 = -2
filename:       /in/37MM0
function name:  (null)
number of ops:  13
compiled vars:  !0 = $a
line     #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   3     0  E >   NEW                                              $1      :-5
         1        SEND_VAL_EX                                              '2017-11-01+13%3A24%3A52'
         2        NEW                                              $2      :-2
         3        SEND_VAL_EX                                              'Europe%2FBerlin'
         4        DO_FCALL                                      0          
         5        BRK                                                      
         6        DO_FCALL                                      0          
         7        ASSIGN                                                   !0, $1
   5     8        INIT_METHOD_CALL                                         !0, 'format'
         9        SEND_VAL_EX                                              'Y-m-d%5CTH%3Ai%3AsO'
        10        DO_FCALL                                      0  $6      
        11        ECHO                                                     $6
        12      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 7.1.0