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<?php $array = [ 0 => 'Apple', 2 => 'Orange', 5 => 'Pear', 8 => 'Pear' ]; var_export( array_fill(0, array_key_last($array), null) + $array ); echo "\n---\n"; var_export( $array + array_fill(0, array_key_last($array), null) ); echo "\n---\n"; var_export( array_merge( array_fill(0, array_key_last($array), null), $array ) );
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/lCS0n
function name:  (null)
number of ops:  43
compiled vars:  !0 = $array
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   ASSIGN                                                   !0, <array>
   10     1        INIT_FCALL                                               'var_export'
   11     2        INIT_FCALL                                               'array_fill'
          3        SEND_VAL                                                 0
          4        INIT_FCALL                                               'array_key_last'
          5        SEND_VAR                                                 !0
          6        DO_ICALL                                         $2      
          7        SEND_VAR                                                 $2
          8        SEND_VAL                                                 null
          9        DO_ICALL                                         $3      
   12    10        ADD                                              ~4      $3, !0
         11        SEND_VAL                                                 ~4
   10    12        DO_ICALL                                                 
   15    13        ECHO                                                     '%0A---%0A'
   17    14        INIT_FCALL                                               'var_export'
   19    15        INIT_FCALL                                               'array_fill'
         16        SEND_VAL                                                 0
         17        INIT_FCALL                                               'array_key_last'
         18        SEND_VAR                                                 !0
         19        DO_ICALL                                         $6      
         20        SEND_VAR                                                 $6
         21        SEND_VAL                                                 null
         22        DO_ICALL                                         $7      
         23        ADD                                              ~8      !0, $7
         24        SEND_VAL                                                 ~8
   17    25        DO_ICALL                                                 
   22    26        ECHO                                                     '%0A---%0A'
   24    27        INIT_FCALL                                               'var_export'
   25    28        INIT_FCALL                                               'array_merge'
   26    29        INIT_FCALL                                               'array_fill'
         30        SEND_VAL                                                 0
         31        INIT_FCALL                                               'array_key_last'
         32        SEND_VAR                                                 !0
         33        DO_ICALL                                         $10     
         34        SEND_VAR                                                 $10
         35        SEND_VAL                                                 null
         36        DO_ICALL                                         $11     
         37        SEND_VAR                                                 $11
   27    38        SEND_VAR                                                 !0
   25    39        DO_ICALL                                         $12     
   27    40        SEND_VAR                                                 $12
   24    41        DO_ICALL                                                 
   29    42      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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