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<?php var_dump(datetime::createFromFormat('!U H', '3600 01')->getTimestamp());
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/21PWU
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        INIT_STATIC_METHOD_CALL                                  'datetime', 'createFromFormat'
         2        SEND_VAL                                                 '%21U+H'
         3        SEND_VAL                                                 '3600+01'
         4        DO_FCALL                                      0  $0      
         5        INIT_METHOD_CALL                                         $0, 'getTimestamp'
         6        DO_FCALL                                      0  $1      
         7        SEND_VAR                                                 $1
         8        DO_ICALL                                                 
         9      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 7.4.0