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<?php $array = [ 'a' => 2, 'z' => 2, 'd' => 1 ]; $allowlist = ['a', 'd']; uksort( $array, fn($a, $b) => [$array[$b], in_array($b, $allowlist)] <=> [$array[$a], in_array($a, $allowlist)] ); var_export($array);
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/hETJR
function name:  (null)
number of ops:  13
compiled vars:  !0 = $array, !1 = $allowlist
line      #* E I O op                               fetch          ext  return  operands
-----------------------------------------------------------------------------------------
    3     0  E >   ASSIGN                                                       !0, <array>
    8     1        ASSIGN                                                       !1, <array>
   10     2        INIT_FCALL                                                   'uksort'
   11     3        SEND_REF                                                     !0
   12     4        DECLARE_LAMBDA_FUNCTION                              ~4      [0]
          5        BIND_LEXICAL                                                 ~4, !0
          6        BIND_LEXICAL                                                 ~4, !1
   16     7        SEND_VAL                                                     ~4
   10     8        DO_ICALL                                                     
   18     9        INIT_FCALL                                                   'var_export'
         10        SEND_VAR                                                     !0
         11        DO_ICALL                                                     
         12      > 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/hETJR
function name:  {closure:/in/hETJR:12}
number of ops:  15
compiled vars:  !0 = $a, !1 = $b, !2 = $array, !3 = $allowlist
line      #* E I O op                               fetch          ext  return  operands
-----------------------------------------------------------------------------------------
   12     0  E >   RECV                                                 !0      
          1        RECV                                                 !1      
          2        BIND_STATIC                                                  !2
          3        BIND_STATIC                                                  !3
   13     4        FETCH_DIM_R                                          ~4      !2, !1
          5        INIT_ARRAY                                           ~5      ~4
          6        FRAMELESS_ICALL_2                in_array            ~6      !1, !3
          7        ADD_ARRAY_ELEMENT                                    ~5      ~6
   15     8        FETCH_DIM_R                                          ~7      !2, !0
          9        INIT_ARRAY                                           ~8      ~7
         10        FRAMELESS_ICALL_2                in_array            ~9      !0, !3
         11        ADD_ARRAY_ELEMENT                                    ~8      ~9
         12        SPACESHIP                                            ~10     ~5, ~8
         13      > RETURN                                                       ~10
   16    14*     > RETURN                                                       null

End of Dynamic Function 0

Generated using Vulcan Logic Dumper, using php 8.5.0


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