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<?php $a = 'false'; $b = isset($a); $c = !empty($b); var_dump($b); var_dump($c);
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/ZWmnl
function name:  (null)
number of ops:  13
compiled vars:  !0 = $a, !1 = $b, !2 = $c
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    2     0  E >   ASSIGN                                                   !0, 'false'
    3     1        ISSET_ISEMPTY_CV                                 ~4      !0
          2        ASSIGN                                                   !1, ~4
    4     3        ISSET_ISEMPTY_CV                                 ~6      !1
          4        BOOL_NOT                                         ~7      ~6
          5        ASSIGN                                                   !2, ~7
    5     6        INIT_FCALL                                               'var_dump'
          7        SEND_VAR                                                 !1
          8        DO_ICALL                                                 
    6     9        INIT_FCALL                                               'var_dump'
         10        SEND_VAR                                                 !2
         11        DO_ICALL                                                 
         12      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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