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<?php $string = "foo"; $a = "string"; $b = $$a[0]; var_dump($b);
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/jHunM
function name:  (null)
number of ops:  9
compiled vars:  !0 = $string, !1 = $a, !2 = $b
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    4     0  E >   ASSIGN                                                   !0, 'foo'
    5     1        ASSIGN                                                   !1, 'string'
    6     2        FETCH_R                      local               ~5      !1
          3        FETCH_DIM_R                                      ~6      ~5, 0
          4        ASSIGN                                                   !2, ~6
    8     5        INIT_FCALL                                               'var_dump'
          6        SEND_VAR                                                 !2
          7        DO_ICALL                                                 
          8      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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