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<?php echo file_get_contents(__FILE__); echo PHP_EOL . '=============' . PHP_EOL; system('ls');
based on S5KSu
Finding entry points
Branch analysis from position: 0
Jump found. Position 1 = -2
filename:       /in/5FmQt
function name:  (null)
number of ops:  9
compiled vars:  none
line     #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   2     0  E >   INIT_FCALL                                               'file_get_contents'
         1        SEND_VAL                                                 '%2Fin%2F5FmQt'
         2        DO_ICALL                                         $0      
         3        ECHO                                                     $0
   3     4        ECHO                                                     '%0A%3D%3D%3D%3D%3D%3D%3D%3D%3D%3D%3D%3D%3D%0A'
   4     5        INIT_FCALL                                               'system'
         6        SEND_VAL                                                 'ls'
         7        DO_ICALL                                                 
         8      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 7.2.0