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<?php function b() { global $a; $a++; } global $a; $a = 2; b(); var_dump($a); ?>
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/lHSQ3
function name:  (null)
number of ops:  8
compiled vars:  !0 = $a
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    8     0  E >   BIND_GLOBAL                                              !0, 'a'
    9     1        ASSIGN                                                   !0, 2
   10     2        INIT_FCALL                                               'b'
          3        DO_FCALL                                      0          
   11     4        INIT_FCALL                                               'var_dump'
          5        SEND_VAR                                                 !0
          6        DO_ICALL                                                 
   13     7      > RETURN                                                   1

Function b:
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/lHSQ3
function name:  b
number of ops:  3
compiled vars:  !0 = $a
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    4     0  E >   BIND_GLOBAL                                              !0, 'a'
    5     1        PRE_INC                                                  !0
    6     2      > RETURN                                                   null

End of function b

Generated using Vulcan Logic Dumper, using php 8.0.0


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