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<?php declare(strict_types=1); function foo(int $x, ?int &$y = null) { var_dump($y); if ($y != null) { $y = $x ** 2; } return $x * 2; } var_dump([foo(5, $a), $a]);
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/bFppE
function name:  (null)
number of ops:  10
compiled vars:  !0 = $a
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   13     0  E >   INIT_FCALL                                               'var_dump'
          1        INIT_FCALL                                               'foo'
          2        SEND_VAL                                                 5
          3        SEND_REF                                                 !0
          4        DO_FCALL                                      0  $1      
          5        INIT_ARRAY                                       ~2      $1
          6        ADD_ARRAY_ELEMENT                                ~2      !0
          7        SEND_VAL                                                 ~2
          8        DO_ICALL                                                 
          9      > RETURN                                                   1

Function foo:
Finding entry points
Branch analysis from position: 0
2 jumps found. (Code = 43) Position 1 = 7, Position 2 = 9
Branch analysis from position: 7
1 jumps found. (Code = 62) Position 1 = -2
Branch analysis from position: 9
filename:       /in/bFppE
function name:  foo
number of ops:  12
compiled vars:  !0 = $x, !1 = $y
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    5     0  E >   RECV                                             !0      
          1        RECV_INIT                                        !1      null
    6     2        INIT_FCALL                                               'var_dump'
          3        SEND_VAR                                                 !1
          4        DO_ICALL                                                 
    7     5        IS_NOT_EQUAL                                             !1, null
          6      > JMPZ                                                     ~3, ->9
    8     7    >   POW                                              ~4      !0, 2
          8        ASSIGN                                                   !1, ~4
   10     9    >   MUL                                              ~6      !0, 2
         10      > RETURN                                                   ~6
   11    11*     > RETURN                                                   null

End of function foo

Generated using Vulcan Logic Dumper, using php 8.0.0


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