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<?php $foo = ["a", "B", "æ", "Æ", "c", "A", "b", "C", "1"]; usort($foo, function($a, $b) { return [mb_strtoupper($a), $a] <=> [mb_strtoupper($b), $b]; }); var_export($foo);
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/03tkA
function name:  (null)
number of ops:  10
compiled vars:  !0 = $foo
line      #* E I O op                               fetch          ext  return  operands
-----------------------------------------------------------------------------------------
    2     0  E >   ASSIGN                                                       !0, <array>
    4     1        INIT_FCALL                                                   'usort'
          2        SEND_REF                                                     !0
          3        DECLARE_LAMBDA_FUNCTION                              ~2      [0]
    6     4        SEND_VAL                                                     ~2
    4     5        DO_ICALL                                                     
    8     6        INIT_FCALL                                                   'var_export'
          7        SEND_VAR                                                     !0
          8        DO_ICALL                                                     
          9      > 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/03tkA
function name:  {closure:/in/03tkA:4}
number of ops:  15
compiled vars:  !0 = $a, !1 = $b
line      #* E I O op                               fetch          ext  return  operands
-----------------------------------------------------------------------------------------
    4     0  E >   RECV                                                 !0      
          1        RECV                                                 !1      
    5     2        INIT_FCALL                                                   'mb_strtoupper'
          3        SEND_VAR                                                     !0
          4        DO_ICALL                                             $2      
          5        INIT_ARRAY                                           ~3      $2
          6        ADD_ARRAY_ELEMENT                                    ~3      !0
          7        INIT_FCALL                                                   'mb_strtoupper'
          8        SEND_VAR                                                     !1
          9        DO_ICALL                                             $4      
         10        INIT_ARRAY                                           ~5      $4
         11        ADD_ARRAY_ELEMENT                                    ~5      !1
         12        SPACESHIP                                            ~6      ~3, ~5
         13      > RETURN                                                       ~6
    6    14*     > RETURN                                                       null

End of Dynamic Function 0

Generated using Vulcan Logic Dumper, using php 8.5.0


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