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<?php $arr = [ ['a' => 'a', 'int' => 10], ['a' => 'foo', 'int' => 5], ['a' => 'bar', 'int' => 12] ]; usort($arr, function($a, $b) { return $a['int'] <=> $b['int']; }); var_export($arr); echo "\n---\n"; $arr = [ ['a' => 'a', 'int' => 10], ['a' => 'foo', 'int' => 5], ['a' => 'bar', 'int' => 12] ]; usort($arr, fn($a, $b) => $a['int'] <=> $b['int']); var_export($arr); echo "\n---\n"; $arr = [ ['a' => 'a', 'int' => 10], ['a' => 'foo', 'int' => 5], ['a' => 'bar', 'int' => 5] ]; usort($arr, fn($a, $b) => [$a['int'], $a['a']] <=> [$b['int'], $b['a']]); var_export($arr);
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/QjNg7
function name:  (null)
number of ops:  30
compiled vars:  !0 = $arr
line      #* E I O op                               fetch          ext  return  operands
-----------------------------------------------------------------------------------------
    3     0  E >   ASSIGN                                                       !0, <array>
    9     1        INIT_FCALL                                                   'usort'
          2        SEND_REF                                                     !0
          3        DECLARE_LAMBDA_FUNCTION                              ~2      [0]
          4        SEND_VAL                                                     ~2
          5        DO_ICALL                                                     
   10     6        INIT_FCALL                                                   'var_export'
          7        SEND_VAR                                                     !0
          8        DO_ICALL                                                     
   12     9        ECHO                                                         '%0A---%0A'
   14    10        ASSIGN                                                       !0, <array>
   20    11        INIT_FCALL                                                   'usort'
         12        SEND_REF                                                     !0
         13        DECLARE_LAMBDA_FUNCTION                              ~6      [1]
         14        SEND_VAL                                                     ~6
         15        DO_ICALL                                                     
   21    16        INIT_FCALL                                                   'var_export'
         17        SEND_VAR                                                     !0
         18        DO_ICALL                                                     
   23    19        ECHO                                                         '%0A---%0A'
   25    20        ASSIGN                                                       !0, <array>
   31    21        INIT_FCALL                                                   'usort'
         22        SEND_REF                                                     !0
         23        DECLARE_LAMBDA_FUNCTION                              ~10     [2]
         24        SEND_VAL                                                     ~10
         25        DO_ICALL                                                     
   32    26        INIT_FCALL                                                   'var_export'
         27        SEND_VAR                                                     !0
         28        DO_ICALL                                                     
         29      > 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/QjNg7
function name:  {closure:/in/QjNg7:9}
number of ops:  7
compiled vars:  !0 = $a, !1 = $b
line      #* E I O op                               fetch          ext  return  operands
-----------------------------------------------------------------------------------------
    9     0  E >   RECV                                                 !0      
          1        RECV                                                 !1      
          2        FETCH_DIM_R                                          ~2      !0, 'int'
          3        FETCH_DIM_R                                          ~3      !1, 'int'
          4        SPACESHIP                                            ~4      ~2, ~3
          5      > RETURN                                                       ~4
          6*     > RETURN                                                       null

End of Dynamic Function 0

Dynamic Function 1
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/QjNg7
function name:  {closure:/in/QjNg7:20}
number of ops:  7
compiled vars:  !0 = $a, !1 = $b
line      #* E I O op                               fetch          ext  return  operands
-----------------------------------------------------------------------------------------
   20     0  E >   RECV                                                 !0      
          1        RECV                                                 !1      
          2        FETCH_DIM_R                                          ~2      !0, 'int'
          3        FETCH_DIM_R                                          ~3      !1, 'int'
          4        SPACESHIP                                            ~4      ~2, ~3
          5      > RETURN                                                       ~4
          6*     > RETURN                                                       null

End of Dynamic Function 1

Dynamic Function 2
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/QjNg7
function name:  {closure:/in/QjNg7:31}
number of ops:  13
compiled vars:  !0 = $a, !1 = $b
line      #* E I O op                               fetch          ext  return  operands
-----------------------------------------------------------------------------------------
   31     0  E >   RECV                                                 !0      
          1        RECV                                                 !1      
          2        FETCH_DIM_R                                          ~2      !0, 'int'
          3        INIT_ARRAY                                           ~3      ~2
          4        FETCH_DIM_R                                          ~4      !0, 'a'
          5        ADD_ARRAY_ELEMENT                                    ~3      ~4
          6        FETCH_DIM_R                                          ~5      !1, 'int'
          7        INIT_ARRAY                                           ~6      ~5
          8        FETCH_DIM_R                                          ~7      !1, 'a'
          9        ADD_ARRAY_ELEMENT                                    ~6      ~7
         10        SPACESHIP                                            ~8      ~3, ~6
         11      > RETURN                                                       ~8
         12*     > RETURN                                                       null

End of Dynamic Function 2

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