Online PHP editor | perf for 6nFVv

<?php class IteratorV1 implements Iterator { private $index; public $table; function __construct(SplFixedArray $table){ $this->table = $table; $this->rewind(); } function rewind(){ $this->index = -1; $this->next(); } function next(){ while( ++$this->index < $this->table->count() && $this->table->offsetGet($this->index) === NULL ); } function valid(){ return $this->index < $this->table->count(); } function key(){ return $this->table->offsetGet($this->index)->uncommentMe; } function current(){ return $this->table->offsetGet($this->index)->uncommentMe; } } class IteratorV2 implements Iterator { private $index; private $array; private $entry; function __construct(SplFixedArray $array){ $this->array = $array; $this->rewind(); } function rewind(){ for( $this->index = 0; $this->index < $this->array->count(); $this->index++ ){ $this->entry = $this->array->offsetGet($this->index); if($this->entry !== NULL){ return; } } $this->entry = NULL; } function next(){ for( $this->index++; $this->index < $this->array->count(); $this->index++ ){ $this->entry = $this->array->offsetGet($this->index); if($this->entry !== NULL){ return; } } $this->entry = NULL; } function valid(){ return $this->entry !== NULL; } function key(){ return $this->entry->uncommentMe; } function current(){ return $this->entry->uncommentMe; } } class Entry{ public $uncommentMe = 123; } $array = new SplFixedArray(2 ** 18); for($i = 0; $i < (2 ** 18) / 2; $i++){ $array->offsetSet($i * 2, new Entry); } echo "should be slower:\n"; $st = microtime(true); foreach(new IteratorV1($array) as $key => $content){} echo number_format(microtime(true) - $st, 10) . "s\n"; echo "should be faster:\n"; $st = microtime(true); foreach(new IteratorV2($array) as $key => $content){} echo number_format(microtime(true) - $st, 10) . "s\n";

Version	System time (s)	User time (s)	Memory (MiB)
7.1.9	0.103	0.336	29.94
7.1.8	0.196	0.323	29.28
7.1.7	0.126	0.339	28.41
7.1.6	0.152	0.394	46.78
7.1.5	0.122	0.332	46.61
7.1.4	0.146	0.368	46.25
7.1.3	0.128	0.345	46.28
7.1.2	0.122	0.323	46.43
7.1.1	0.114	0.319	28.00
7.1.0	0.185	0.420	28.07
7.0.23	0.102	0.369	29.45
7.0.22	0.101	0.340	29.33
7.0.21	0.107	0.370	28.16
7.0.20	0.181	0.383	28.50
7.0.19	0.110	0.342	28.09
7.0.18	0.147	0.334	27.58
7.0.17	0.112	0.343	27.77
7.0.16	0.106	0.354	28.06
7.0.15	0.178	0.340	27.93
7.0.14	0.143	0.367	27.84
7.0.13	0.173	0.349	28.18
7.0.12	0.131	0.374	28.28
7.0.11	0.122	0.426	28.13
7.0.10	0.099	0.347	27.92
7.0.9	0.106	0.348	27.87
7.0.8	0.119	0.363	28.17
7.0.7	0.163	0.349	28.18
7.0.6	0.347	0.380	28.92
7.0.5	0.429	0.469	27.88
7.0.4	0.119	0.352	29.54
7.0.3	0.116	0.355	28.33
7.0.2	0.218	0.370	28.20
7.0.1	0.244	0.419	28.24
7.0.0	0.247	0.338	29.02