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<?php //var_dump($_SERVER); exec("echo 3\n"); ?>
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/c2Pju
function name:  (null)
number of ops:  4
compiled vars:  none
line     #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   4     0  E >   INIT_FCALL                                               'exec'
         1        SEND_VAL                                                 'echo+3%0A'
         2        DO_ICALL                                                 
   6     3      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 7.3.0