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<?php var_dump(file_get_contents("php://filter/resource=/etc/passwd/read=string.toupper"));
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/fWYUX
function name:  (null)
number of ops:  7
compiled vars:  none
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    2     0  E >   INIT_FCALL                                               'var_dump'
          1        INIT_FCALL                                               'file_get_contents'
          2        SEND_VAL                                                 'php%3A%2F%2Ffilter%2Fresource%3D%2Fetc%2Fpasswd%2Fread%3Dstring.toupper'
          3        DO_ICALL                                         $0      
          4        SEND_VAR                                                 $0
          5        DO_ICALL                                                 
          6      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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