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<?php function recursiveArrayReverse($a) { $size = count($a); if ($size < 2) { return $a; } return array_merge( [$a[$size - 1]], recursiveArrayReverse( array_slice($a, 1, -1) ), [$a[0]] ); } $array = [1, 2, 3, 4, 5, 6, 7]; $array = recursiveArrayReverse($array); var_export($array);
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/lK4DZ
function name:  (null)
number of ops:  9
compiled vars:  !0 = $array
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   17     0  E >   ASSIGN                                                   !0, <array>
   18     1        INIT_FCALL                                               'recursivearrayreverse'
          2        SEND_VAR                                                 !0
          3        DO_FCALL                                      0  $2      
          4        ASSIGN                                                   !0, $2
   19     5        INIT_FCALL                                               'var_export'
          6        SEND_VAR                                                 !0
          7        DO_ICALL                                                 
          8      > RETURN                                                   1

Function recursivearrayreverse:
Finding entry points
Branch analysis from position: 0
2 jumps found. (Code = 43) Position 1 = 5, Position 2 = 6
Branch analysis from position: 5
1 jumps found. (Code = 62) Position 1 = -2
Branch analysis from position: 6
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/lK4DZ
function name:  recursiveArrayReverse
number of ops:  26
compiled vars:  !0 = $a, !1 = $size
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   RECV                                             !0      
    4     1        COUNT                                            ~2      !0
          2        ASSIGN                                                   !1, ~2
    5     3        IS_SMALLER                                               !1, 2
          4      > JMPZ                                                     ~4, ->6
    6     5    > > RETURN                                                   !0
    8     6    >   INIT_FCALL                                               'array_merge'
    9     7        SUB                                              ~5      !1, 1
          8        FETCH_DIM_R                                      ~6      !0, ~5
          9        INIT_ARRAY                                       ~7      ~6
         10        SEND_VAL                                                 ~7
   10    11        INIT_FCALL_BY_NAME                                       'recursiveArrayReverse'
   11    12        INIT_FCALL                                               'array_slice'
         13        SEND_VAR                                                 !0
         14        SEND_VAL                                                 1
         15        SEND_VAL                                                 -1
         16        DO_ICALL                                         $8      
         17        SEND_VAR_NO_REF_EX                                       $8
   10    18        DO_FCALL                                      0  $9      
   11    19        SEND_VAR                                                 $9
   13    20        FETCH_DIM_R                                      ~10     !0, 0
         21        INIT_ARRAY                                       ~11     ~10
         22        SEND_VAL                                                 ~11
    8    23        DO_ICALL                                         $12     
   13    24      > RETURN                                                   $12
   15    25*     > RETURN                                                   null

End of function recursivearrayreverse

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