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<?php $a = [0, 1, 2, 3, 4, 5, 6]; $b = [4]; print_r(array_udiff($a, $b, function($x, $y) { return $x <=> $y; })); print_r(array_udiff($a, $b, function($x, $y) { return $x == $y ? 0 : -1; }));
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/V3kbD
function name:  (null)
number of ops:  21
compiled vars:  !0 = $a, !1 = $b
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   ASSIGN                                                   !0, <array>
    4     1        ASSIGN                                                   !1, <array>
    6     2        INIT_FCALL                                               'print_r'
          3        INIT_FCALL                                               'array_udiff'
          4        SEND_VAR                                                 !0
          5        SEND_VAR                                                 !1
          6        DECLARE_LAMBDA_FUNCTION                          ~4      [0]
    8     7        SEND_VAL                                                 ~4
    6     8        DO_ICALL                                         $5      
    8     9        SEND_VAR                                                 $5
    6    10        DO_ICALL                                                 
   10    11        INIT_FCALL                                               'print_r'
         12        INIT_FCALL                                               'array_udiff'
         13        SEND_VAR                                                 !0
         14        SEND_VAR                                                 !1
         15        DECLARE_LAMBDA_FUNCTION                          ~7      [1]
   12    16        SEND_VAL                                                 ~7
   10    17        DO_ICALL                                         $8      
   12    18        SEND_VAR                                                 $8
   10    19        DO_ICALL                                                 
   12    20      > RETURN                                                   1


Dynamic Functions:
Dynamic Function 0
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/V3kbD
function name:  {closure}
number of ops:  5
compiled vars:  !0 = $x, !1 = $y
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    6     0  E >   RECV                                             !0      
          1        RECV                                             !1      
    7     2        SPACESHIP                                        ~2      !0, !1
          3      > RETURN                                                   ~2
    8     4*     > RETURN                                                   null

End of Dynamic Function 0

Dynamic Function 1
Finding entry points
Branch analysis from position: 0
2 jumps found. (Code = 43) Position 1 = 4, Position 2 = 6
Branch analysis from position: 4
1 jumps found. (Code = 42) Position 1 = 7
Branch analysis from position: 7
1 jumps found. (Code = 62) Position 1 = -2
Branch analysis from position: 6
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/V3kbD
function name:  {closure}
number of ops:  9
compiled vars:  !0 = $x, !1 = $y
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   10     0  E >   RECV                                             !0      
          1        RECV                                             !1      
   11     2        IS_EQUAL                                                 !0, !1
          3      > JMPZ                                                     ~2, ->6
          4    >   QM_ASSIGN                                        ~3      0
          5      > JMP                                                      ->7
          6    >   QM_ASSIGN                                        ~3      -1
          7    > > RETURN                                                   ~3
   12     8*     > RETURN                                                   null

End of Dynamic Function 1

Generated using Vulcan Logic Dumper, using php 8.0.0


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