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<?php class IteratorWithFilter { public $generator; public function __construct(array $data) { $this->generator = new \ArrayIterator($data); } public function filter() { $this->generator = new \CallbackFilterIterator($this->generator, function ($row) { return true; }); return $this; } } function createIterator() { $iter = new IteratorWithFilter([['a'], ['b']]); return $iter->filter(); } for ($i = 0; $i < 50 * 1000; $i++) { createIterator(); if (($i % 1000) === 0) { // gc_collect_cycles(); // explicit GC does not help... echo round(memory_get_usage() / (1024 * 1024), 3) . " MiB\n"; } }
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 42) Position 1 = 17
Branch analysis from position: 17
2 jumps found. (Code = 44) Position 1 = 19, Position 2 = 2
Branch analysis from position: 19
1 jumps found. (Code = 62) Position 1 = -2
Branch analysis from position: 2
2 jumps found. (Code = 43) Position 1 = 7, Position 2 = 16
Branch analysis from position: 7
2 jumps found. (Code = 44) Position 1 = 19, Position 2 = 2
Branch analysis from position: 19
Branch analysis from position: 2
Branch analysis from position: 16
filename:       /in/UpmHK
function name:  (null)
number of ops:  20
compiled vars:  !0 = $i
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   27     0  E >   ASSIGN                                                   !0, 0
          1      > JMP                                                      ->17
   28     2    >   INIT_FCALL                                               'createiterator'
          3        DO_FCALL                                      0          
   30     4        MOD                                              ~3      !0, 1000
          5        IS_IDENTICAL                                             ~3, 0
          6      > JMPZ                                                     ~4, ->16
   32     7    >   INIT_FCALL                                               'round'
          8        INIT_FCALL                                               'memory_get_usage'
          9        DO_ICALL                                         $5      
         10        DIV                                              ~6      $5, 1048576
         11        SEND_VAL                                                 ~6
         12        SEND_VAL                                                 3
         13        DO_ICALL                                         $7      
         14        CONCAT                                           ~8      $7, '+MiB%0A'
         15        ECHO                                                     ~8
   27    16    >   PRE_INC                                                  !0
         17    >   IS_SMALLER                                               !0, 50000
         18      > JMPNZ                                                    ~10, ->2
   34    19    > > RETURN                                                   1

Function %00%7Bclosure%7D%2Fin%2FUpmHK%3A14%240:
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/UpmHK
function name:  {closure}
number of ops:  3
compiled vars:  !0 = $row
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   14     0  E >   RECV                                             !0      
   15     1      > RETURN                                                   <true>
   16     2*     > RETURN                                                   null

End of function %00%7Bclosure%7D%2Fin%2FUpmHK%3A14%240

Function createiterator:
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/UpmHK
function name:  createIterator
number of ops:  8
compiled vars:  !0 = $iter
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   23     0  E >   NEW                                              $1      'IteratorWithFilter'
          1        SEND_VAL_EX                                              <array>
          2        DO_FCALL                                      0          
          3        ASSIGN                                                   !0, $1
   24     4        INIT_METHOD_CALL                                         !0, 'filter'
          5        DO_FCALL                                      0  $4      
          6      > RETURN                                                   $4
   25     7*     > RETURN                                                   null

End of function createiterator

Class IteratorWithFilter:
Function __construct:
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/UpmHK
function name:  __construct
number of ops:  7
compiled vars:  !0 = $data
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    7     0  E >   RECV                                             !0      
    9     1        NEW                                              $2      'ArrayIterator'
          2        SEND_VAR_EX                                              !0
          3        DO_FCALL                                      0          
          4        ASSIGN_OBJ                                               'generator'
          5        OP_DATA                                                  $2
   10     6      > RETURN                                                   null

End of function __construct

Function filter:
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/UpmHK
function name:  filter
number of ops:  12
compiled vars:  none
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   14     0  E >   NEW                                              $1      'CallbackFilterIterator'
          1        CHECK_FUNC_ARG                                           
          2        FETCH_OBJ_FUNC_ARG                               $2      'generator'
          3        SEND_FUNC_ARG                                            $2
          4        DECLARE_LAMBDA_FUNCTION                                  '%00%7Bclosure%7D%2Fin%2FUpmHK%3A14%240'
   16     5        SEND_VAL_EX                                              ~3
          6        DO_FCALL                                      0          
   14     7        ASSIGN_OBJ                                               'generator'
   16     8        OP_DATA                                                  $1
   18     9        FETCH_THIS                                       ~5      
         10      > RETURN                                                   ~5
   19    11*     > RETURN                                                   null

End of function filter

End of class IteratorWithFilter.

Generated using Vulcan Logic Dumper, using php 8.0.0


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