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<?php $yourArray = [ ['item1' => 80], ['item2' => 25], ['item3' => 85], ]; usort( $yourArray, fn(array $a, array $b): int => reset($a) /* get the first array elements from $a */ <=> /* <--- the spaceship operator */ reset($b) /* and from $b for comparison */ ); print_r($yourArray);
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/B2e2f
function name:  (null)
number of ops:  10
compiled vars:  !0 = $yourArray
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   ASSIGN                                                   !0, <array>
   10     1        INIT_FCALL                                               'usort'
   11     2        SEND_REF                                                 !0
   12     3        DECLARE_LAMBDA_FUNCTION                          ~2      [0]
   16     4        SEND_VAL                                                 ~2
   10     5        DO_ICALL                                                 
   18     6        INIT_FCALL                                               'print_r'
          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/B2e2f
function name:  {closure}
number of ops:  13
compiled vars:  !0 = $a, !1 = $b
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   12     0  E >   RECV                                             !0      
          1        RECV                                             !1      
   13     2        INIT_FCALL                                               'reset'
          3        SEND_REF                                                 !0
          4        DO_ICALL                                         $2      
   15     5        INIT_FCALL                                               'reset'
          6        SEND_REF                                                 !1
          7        DO_ICALL                                         $3      
          8        SPACESHIP                                        ~4      $2, $3
          9        VERIFY_RETURN_TYPE                                       ~4
         10      > RETURN                                                   ~4
   16    11*       VERIFY_RETURN_TYPE                                       
         12*     > RETURN                                                   null

End of Dynamic Function 0

Generated using Vulcan Logic Dumper, using php 8.0.0


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