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<?php # Forget array_merge PHP 7.4 Spread Operator in Array Expression. # ONLY FOR PHP 7.4 + #/!\ PERFORMANCE BEST PRACTIVE /!\ $args = ['foo', 'bar', 'baz']; $arr = [...$args, 'buz']; var_dump($arr); # MULTIPLE SPREAD $arr1 = [1, 2, 3]; $arr2 = [4, 5, 6]; $arr3 = [...$arr1, ...$arr2]; $arr4 = [...$arr1, ...$arr3, 7, 8, 9]; var_dump($arr4); # SPREAD WITH FUNCTION function buildArray() { return ['red', 'green', 'blue']; } $arr5 = [...buildArray(), 'pink', 'violet', 'yellow']; var_dump($arr5); # SPREAD WITH GENERATOR function generator() { for ($i = 3; $i <= 5; $i++) { yield $i; } } $arr6 = [0, 1, 2, ...generator()]; var_dump($arr6); # SPEACIAL USECASE WHEN YOU NEED TO UNPACK ELEMENT WITH REFERENCE # $arr1 = ['red', 'green', 'blue']; # $arr2 = [...&$arr1]; # This will throw a syntax error because ...& isn't supported yet # To do that you will use another way like this : $arr7 = 'red'; $arr8 = [&$arr7, 'green', 'blue']; $arr9 = ['white', ...$arr8, 'black']; var_dump($arr9);
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/hfFZm
function name:  (null)
number of ops:  58
compiled vars:  !0 = $args, !1 = $arr, !2 = $arr1, !3 = $arr2, !4 = $arr3, !5 = $arr4, !6 = $arr5, !7 = $arr6, !8 = $arr7, !9 = $arr8, !10 = $arr9
line      #* E I O op                               fetch          ext  return  operands
-----------------------------------------------------------------------------------------
    8     0  E >   ASSIGN                                                       !0, <array>
    9     1        INIT_ARRAY                                           ~12     
          2        ADD_ARRAY_UNPACK                                     ~12     !0
          3        ADD_ARRAY_ELEMENT                                    ~12     'buz'
          4        ASSIGN                                                       !1, ~12
   10     5        INIT_FCALL                                                   'var_dump'
          6        SEND_VAR                                                     !1
          7        DO_ICALL                                                     
   13     8        ASSIGN                                                       !2, <array>
   14     9        ASSIGN                                                       !3, <array>
   15    10        INIT_ARRAY                                           ~17     
         11        ADD_ARRAY_UNPACK                                     ~17     !2
         12        ADD_ARRAY_UNPACK                                     ~17     !3
         13        ASSIGN                                                       !4, ~17
   16    14        INIT_ARRAY                                           ~19     
         15        ADD_ARRAY_UNPACK                                     ~19     !2
         16        ADD_ARRAY_UNPACK                                     ~19     !4
         17        ADD_ARRAY_ELEMENT                                    ~19     7
         18        ADD_ARRAY_ELEMENT                                    ~19     8
         19        ADD_ARRAY_ELEMENT                                    ~19     9
         20        ASSIGN                                                       !5, ~19
   17    21        INIT_FCALL                                                   'var_dump'
         22        SEND_VAR                                                     !5
         23        DO_ICALL                                                     
   24    24        INIT_FCALL                                                   'buildarray'
         25        DO_FCALL                                          0  $22     
         26        INIT_ARRAY                                           ~23     
         27        ADD_ARRAY_UNPACK                                     ~23     $22
         28        ADD_ARRAY_ELEMENT                                    ~23     'pink'
         29        ADD_ARRAY_ELEMENT                                    ~23     'violet'
         30        ADD_ARRAY_ELEMENT                                    ~23     'yellow'
         31        ASSIGN                                                       !6, ~23
   25    32        INIT_FCALL                                                   'var_dump'
         33        SEND_VAR                                                     !6
         34        DO_ICALL                                                     
   33    35        INIT_ARRAY                                           ~26     0
         36        ADD_ARRAY_ELEMENT                                    ~26     1
         37        ADD_ARRAY_ELEMENT                                    ~26     2
         38        INIT_FCALL                                                   'generator'
         39        DO_FCALL                                          0  $27     
         40        ADD_ARRAY_UNPACK                                     ~26     $27
         41        ASSIGN                                                       !7, ~26
   34    42        INIT_FCALL                                                   'var_dump'
         43        SEND_VAR                                                     !7
         44        DO_ICALL                                                     
   42    45        ASSIGN                                                       !8, 'red'
   43    46        INIT_ARRAY                                           ~31     !8
         47        ADD_ARRAY_ELEMENT                                    ~31     'green'
         48        ADD_ARRAY_ELEMENT                                    ~31     'blue'
         49        ASSIGN                                                       !9, ~31
   44    50        INIT_ARRAY                                           ~33     'white'
         51        ADD_ARRAY_UNPACK                                     ~33     !9
         52        ADD_ARRAY_ELEMENT                                    ~33     'black'
         53        ASSIGN                                                       !10, ~33
   45    54        INIT_FCALL                                                   'var_dump'
         55        SEND_VAR                                                     !10
         56        DO_ICALL                                                     
         57      > RETURN                                                       1

Function buildarray:
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/hfFZm
function name:  buildArray
number of ops:  2
compiled vars:  none
line      #* E I O op                               fetch          ext  return  operands
-----------------------------------------------------------------------------------------
   22     0  E > > RETURN                                                       <array>
   23     1*     > RETURN                                                       null

End of function buildarray

Function generator:
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 42) Position 1 = 5
Branch analysis from position: 5
2 jumps found. (Code = 44) Position 1 = 7, Position 2 = 3
Branch analysis from position: 7
1 jumps found. (Code = 161) Position 1 = -2
Branch analysis from position: 3
2 jumps found. (Code = 44) Position 1 = 7, Position 2 = 3
Branch analysis from position: 7
Branch analysis from position: 3
filename:       /in/hfFZm
function name:  generator
number of ops:  8
compiled vars:  !0 = $i
line      #* E I O op                               fetch          ext  return  operands
-----------------------------------------------------------------------------------------
   28     0  E >   GENERATOR_CREATE                                             
   29     1        ASSIGN                                                       !0, 3
          2      > JMP                                                          ->5
   30     3    >   YIELD                                                        !0
   29     4        PRE_INC                                                      !0
          5    >   IS_SMALLER_OR_EQUAL                                          !0, 5
          6      > JMPNZ                                                        ~4, ->3
   32     7    > > GENERATOR_RETURN                                             

End of function generator

Generated using Vulcan Logic Dumper, using php 8.5.0


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