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<?php $argv[1] = "PDO,FETCH_CLASSTYPE"; ?> <?=constant(explode(',',$argv[1])[0]."::".explode(',',$argv[1])[1])==262144?"Hello, world ":a;
Finding entry points
Branch analysis from position: 0
2 jumps found. (Code = 43) Position 1 = 21, Position 2 = 23
Branch analysis from position: 21
1 jumps found. (Code = 42) Position 1 = 25
Branch analysis from position: 25
1 jumps found. (Code = 62) Position 1 = -2
Branch analysis from position: 23
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/Gf7XM
function name:  (null)
number of ops:  27
compiled vars:  !0 = $argv
line     #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   1     0  E >   ASSIGN_ADD                                    0          !0, 1
         1        OP_DATA                                                  'PDO%2CFETCH_CLASSTYPE'
   2     2        INIT_FCALL                                               'constant'
         3        INIT_FCALL                                               'explode'
         4        SEND_VAL                                                 '%2C'
         5        FETCH_DIM_R                                      ~2      !0, 1
         6        SEND_VAL                                                 ~2
         7        DO_ICALL                                         $3      
         8        FETCH_DIM_R                                      ~4      $3, 0
         9        CONCAT                                           ~5      ~4, '%3A%3A'
        10        INIT_FCALL                                               'explode'
        11        SEND_VAL                                                 '%2C'
        12        FETCH_DIM_R                                      ~6      !0, 1
        13        SEND_VAL                                                 ~6
        14        DO_ICALL                                         $7      
        15        FETCH_DIM_R                                      ~8      $7, 1
        16        CONCAT                                           ~9      ~5, ~8
        17        SEND_VAL                                                 ~9
        18        DO_ICALL                                         $10     
        19        IS_NOT_EQUAL                                     ~11     $10, 262144
        20      > JMPZ                                                     ~11, ->23
        21    >   ASSIGN_BW_OR                                  0  ~12     'Hello%2C+world%0A'
        22      > JMP                                                      ->25
   3    23    >   FETCH_CONSTANT                                   ~13     'a'
        24        ASSIGN_BW_OR                                  0  ~12     ~13
        25    >   ASSIGN_OBJ                                               ~12
        26      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 7.4.0