Microbenchmark of generator implementation

microbench.php

<?php

error_reporting(E_ALL);

function xrange($start, $end, $step = 1) {
    for ($i = $start; $i < $end; $i += $step) {
        yield $i;
    }
}

class RangeIterator implements Iterator {
    protected $start;
    protected $end;
    protected $step;
    
    protected $key;
    protected $value;
    
    public function __construct($start, $end, $step = 1) {
        $this->start = $start;
        $this->end   = $end;
        $this->step  = $step;
    }
    
    public function rewind() {
        $this->key   = 0;
        $this->value = $this->start;
    }
    
    public function valid() {
        return $this->value < $this->end;
    }
    
    public function next() {
        $this->value += $this->step;
        $this->key   += 1;
    }
    
    public function current() {
        return $this->value;
    }
    
    public function key() {
        return $this->key;
    }
}

function urange($start, $end, $step = 1) {
    $result = [];
    for ($i = $start; $i < $end; $i += $step) {
        $result[] = $i;
    }
    return $result;
}

function testTraversable($name, callable $traversableFactory) {
    $startTime = microtime(true);
    foreach ($traversableFactory() as $value) {
        // noop
    }
    echo $name, ' took ', microtime(true) - $startTime, ' seconds.', "\n";
}

function testVariants($count) {
    testTraversable(
        "xrange        ($count)",
        function() use($count) { return xrange(0, $count); }
    );
    testTraversable(
        "RangeIterator ($count)",
        function() use($count) { return new RangeIterator(0, $count); }
    );
    testTraversable(
        "urange        ($count)",
        function() use($count) { return urange(0, $count); }
    );
    testTraversable(
        "range         ($count)",
        function() use($count) { return range(0, $count); }
    );
}

testVariants(1000000);
testVariants(10000);
testVariants(100);

run1.out

xrange        (1000000) took 0.14633202552795 seconds.
RangeIterator (1000000) took 0.5944938659668 seconds.
urange        (1000000) took 0.28175210952759 seconds.
range         (1000000) took 0.23163318634033 seconds.
xrange        (10000) took 0.0015981197357178 seconds.
RangeIterator (10000) took 0.0065171718597412 seconds.
urange        (10000) took 0.0028119087219238 seconds.
range         (10000) took 0.0022850036621094 seconds.
xrange        (100) took 7.8916549682617E-5 seconds.
RangeIterator (100) took 0.00010895729064941 seconds.
urange        (100) took 5.5074691772461E-5 seconds.
range         (100) took 8.082389831543E-5 seconds.

run2.out

xrange        (1000000) took 0.14681696891785 seconds.
RangeIterator (1000000) took 0.60637879371643 seconds.
urange        (1000000) took 0.29368591308594 seconds.
range         (1000000) took 0.22470617294312 seconds.
xrange        (10000) took 0.0014379024505615 seconds.
RangeIterator (10000) took 0.0056979656219482 seconds.
urange        (10000) took 0.002910852432251 seconds.
range         (10000) took 0.0023188591003418 seconds.
xrange        (100) took 5.1021575927734E-5 seconds.
RangeIterator (100) took 0.00014209747314453 seconds.
urange        (100) took 5.4121017456055E-5 seconds.
range         (100) took 4.3869018554688E-5 seconds.

run3.out

xrange        (1000000) took 0.14807891845703 seconds.
RangeIterator (1000000) took 0.60018301010132 seconds.
urange        (1000000) took 0.28284788131714 seconds.
range         (1000000) took 0.22018909454346 seconds.
xrange        (10000) took 0.0013790130615234 seconds.
RangeIterator (10000) took 0.006242036819458 seconds.
urange        (10000) took 0.0016648769378662 seconds.
range         (10000) took 0.0019738674163818 seconds.
xrange        (100) took 9.2029571533203E-5 seconds.
RangeIterator (100) took 0.00013899803161621 seconds.
urange        (100) took 5.1975250244141E-5 seconds.
range         (100) took 4.3153762817383E-5 seconds.

mac mini 2018, i7, php 8, docker for mac

xrange        (1000000) took 0.53661203384399 seconds.
RangeIterator (1000000) took 1.2678070068359 seconds.
urange        (1000000) took 0.28700590133667 seconds.
range         (1000000) took 0.066593170166016 seconds.
xrange        (10000) took 0.005033016204834 seconds.
RangeIterator (10000) took 0.012601137161255 seconds.
urange        (10000) took 0.0026609897613525 seconds.
range         (10000) took 0.00066709518432617 seconds.
xrange        (100) took 0.00012302398681641 seconds.
RangeIterator (100) took 0.00025606155395508 seconds.
urange        (100) took 3.814697265625E-5 seconds.
range         (100) took 3.6001205444336E-5 seconds.

hp 850 g6 i7 docker php 8.1
xrange (1000000) took 0.2816960811615 seconds.
RangeIterator (1000000) took 0.8405749797821 seconds.
urange (1000000) took 0.11258292198181 seconds.
range (1000000) took 0.026424169540405 seconds.
xrange (10000) took 0.0025100708007812 seconds.
RangeIterator (10000) took 0.009044885635376 seconds.
urange (10000) took 0.00084590911865234 seconds.
range (10000) took 0.00028705596923828 seconds.
xrange (100) took 3.2186508178711E-5 seconds.
RangeIterator (100) took 9.1075897216797E-5 seconds.
urange (100) took 7.8678131103516E-6 seconds.
range (100) took 1.9073486328125E-6 seconds.