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<?php $array = [ 'a' => 2, 'z' => 2, 'd' => 1 ]; $allowlist = ['a', 'd']; uksort( $array, fn($a, $b) => $array[$b] <=> $array[$a] ?: in_array($b, $allowlist) <=> in_array($a, $allowlist) ); var_export($array);
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/dQ9eP
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                                  '%00%7Bclosure%7D%2Fin%2FdQ9eP%3A12%240'
          5        BIND_LEXICAL                                             ~4, !0
          6        BIND_LEXICAL                                             ~4, !1
   15     7        SEND_VAL                                                 ~4
          8        DO_ICALL                                                 
   17     9        INIT_FCALL                                               'var_export'
         10        SEND_VAR                                                 !0
         11        DO_ICALL                                                 
         12      > RETURN                                                   1

Function %00%7Bclosure%7D%2Fin%2FdQ9eP%3A12%240:
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/dQ9eP
function name:  {closure}
number of ops:  20
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        FETCH_DIM_R                                      ~5      !2, !0
          6        SPACESHIP                                        ~6      ~4, ~5
          7        JMP_SET                                          ~7      ~6, ->18
   14     8        INIT_FCALL                                               'in_array'
          9        SEND_VAR                                                 !1
         10        SEND_VAR                                                 !3
         11        DO_ICALL                                         $8      
         12        INIT_FCALL                                               'in_array'
         13        SEND_VAR                                                 !0
         14        SEND_VAR                                                 !3
         15        DO_ICALL                                         $9      
         16        SPACESHIP                                        ~10     $8, $9
         17        QM_ASSIGN                                        ~7      ~10
         18      > RETURN                                                   ~7
   15    19*     > RETURN                                                   null

End of function %00%7Bclosure%7D%2Fin%2FdQ9eP%3A12%240

Generated using Vulcan Logic Dumper, using php 8.0.0


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