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<?php var_dump(gmdate(DateTime::RFC2822)); var_dump(gmdate('D, d M Y H:i:s'));
based on HJfEj
Finding entry points
Branch analysis from position: 0
Jump found. Position 1 = -2
filename:       /in/PK6Fr
function name:  (null)
number of ops:  13
compiled vars:  none
line     #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   3     0  E >   INIT_FCALL                                               'var_dump'
         1        INIT_FCALL                                               'gmdate'
         2        SEND_VAL                                                 'D%2C+d+M+Y+H%3Ai%3As+O'
         3        DO_ICALL                                         $0      
         4        SEND_VAR                                                 $0
         5        DO_ICALL                                                 
   4     6        INIT_FCALL                                               'var_dump'
         7        INIT_FCALL                                               'gmdate'
         8        SEND_VAL                                                 'D%2C+d+M+Y+H%3Ai%3As'
         9        DO_ICALL                                         $2      
        10        SEND_VAR                                                 $2
        11        DO_ICALL                                                 
        12      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 7.3.0