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<?php function foo() { return [null, null]; } var_dump(list($a, $b) = foo()); var_dump((bool)[null, null]);
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/lIEa1
function name:  (null)
number of ops:  14
compiled vars:  !0 = $a, !1 = $b
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    7     0  E >   INIT_FCALL                                               'var_dump'
          1        INIT_FCALL                                               'foo'
          2        DO_FCALL                                      0  $2      
          3        FETCH_LIST_R                                     $3      $2, 0
          4        ASSIGN                                                   !0, $3
          5        FETCH_LIST_R                                     $5      $2, 1
          6        ASSIGN                                                   !1, $5
          7        SEND_VAR                                                 $2
          8        DO_ICALL                                                 
    8     9        INIT_FCALL                                               'var_dump'
         10        BOOL                                             ~8      <array>
         11        SEND_VAL                                                 ~8
         12        DO_ICALL                                                 
         13      > RETURN                                                   1

Function foo:
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/lIEa1
function name:  foo
number of ops:  2
compiled vars:  none
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    4     0  E > > RETURN                                                   <array>
    5     1*     > RETURN                                                   null

End of function foo

Generated using Vulcan Logic Dumper, using php 8.0.0


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