Online PHP editor | perf for YQIVJ

@ 2022-02-01T11:06:12Z

<?php

class Action
{
    /** @var \Iterator */
    public $generator;

    public function __construct(array $data)
    {
        $this->generator = new class($this, $data) extends \ArrayIterator
        {
            /** @var Action */
            public $action;

            public function __construct(Action $action, array $data)
            {
                $this->action = $action; // circular ref (can be any custom iterator)
                
                parent::__construct($data);
            }
        };
        
        echo '-- c ' . spl_object_id($this) . "\n";
    }

    public function __destruct()
    {
        echo '-- d ' . spl_object_id($this) . "\n";
    }

    /**
     * @return $this
     */
    public function filter()
    {
        $filterFx = function ($row) {
            return $row !== $this; // always true, dummy use $this
        };
        $this->generator = new \CallbackFilterIterator($this->generator, $filterFx);
        $this->generator->rewind();

        return $this;
    }

    /**
     * @return $this
     */
    public function limit(int $limit = null, int $offset = 0)
    {
        $this->generator = new \LimitIterator($this->generator, $offset, $limit ?? -1);
        $this->generator->rewind();

        return $this;
    }
}

$action = new Action(['a', 'b']);
print_r(iterator_to_array($action->generator));
$action = null; gc_collect_cycles();

$action = new Action(['a', 'b']);
$action->filter();
print_r(iterator_to_array($action->generator));
$action = null; gc_collect_cycles();

$action = new Action(['a', 'b']);
$action->filter()->limit(1);
print_r(iterator_to_array($action->generator));
$action = null; gc_collect_cycles();

echo '----------------' . "\n";

Here you find the average performance (time & memory) of each version. A grayed out version indicates it didn't complete successfully (based on exit-code).

Version	System time (s)	User time (s)	Memory (MiB)
8.5.0	0.011	0.011	20.30
8.4.15	0.001	0.000	14.05
8.4.14	0.016	0.006	19.67
8.4.13	0.006	0.004	17.73
8.4.12	0.008	0.012	22.50
8.4.11	0.004	0.005	19.08
8.4.10	0.005	0.004	18.05
8.4.9	0.012	0.009	20.45
8.4.8	0.007	0.006	20.65
8.4.7	0.013	0.007	18.76
8.4.6	0.010	0.010	20.41
8.4.5	0.014	0.006	20.74
8.4.4	0.012	0.003	17.77
8.4.3	0.010	0.010	20.52
8.4.2	0.007	0.020	17.90
8.4.1	0.012	0.004	19.67
8.3.28	0.011	0.009	18.38
8.3.27	0.014	0.005	16.85
8.3.26	0.012	0.009	16.71
8.3.25	0.011	0.007	18.92
8.3.24	0.010	0.011	17.02
8.3.23	0.015	0.005	16.95
8.3.22	0.010	0.009	19.00
8.3.21	0.008	0.005	16.73
8.3.20	0.005	0.004	16.55
8.3.19	0.015	0.005	17.22
8.3.18	0.012	0.007	18.92
8.3.17	0.009	0.009	17.16
8.3.16	0.006	0.012	16.82
8.3.15	0.010	0.010	17.41
8.3.14	0.006	0.003	17.04
8.3.13	0.005	0.003	18.51
8.3.12	0.000	0.008	19.15
8.3.11	0.006	0.003	20.94
8.3.10	0.014	0.003	16.66
8.3.9	0.006	0.003	26.77
8.3.8	0.003	0.006	16.88
8.3.7	0.007	0.010	16.58
8.3.6	0.012	0.009	18.30
8.3.5	0.006	0.012	20.03
8.3.4	0.012	0.006	18.69
8.3.3	0.010	0.005	18.48
8.3.2	0.004	0.004	24.18
8.3.1	0.008	0.000	24.66
8.3.0	0.000	0.009	26.16
8.2.29	0.010	0.009	17.20
8.2.28	0.013	0.004	19.95
8.2.27	0.007	0.003	16.74
8.2.26	0.006	0.003	17.54
8.2.25	0.003	0.006	18.23
8.2.24	0.009	0.000	17.37
8.2.23	0.006	0.003	22.58
8.2.22	0.000	0.009	24.06
8.2.21	0.006	0.009	26.77
8.2.20	0.005	0.005	16.75
8.2.19	0.021	0.000	18.29
8.2.18	0.016	0.006	25.92
8.2.17	0.006	0.009	18.95
8.2.16	0.010	0.003	22.96
8.2.15	0.005	0.002	25.66
8.2.14	0.004	0.004	24.66
8.2.13	0.000	0.008	26.16
8.2.12	0.004	0.004	19.77
8.2.11	0.006	0.003	20.32
8.2.10	0.004	0.004	20.47
8.1.33	0.013	0.006	22.05
8.1.32	0.005	0.004	16.48
8.1.31	0.010	0.007	16.99
8.1.30	0.006	0.006	17.77
8.1.29	0.006	0.003	30.84
8.1.28	0.009	0.006	25.92
8.1.27	0.004	0.004	23.99
8.1.26	0.003	0.006	26.35
8.1.25	0.004	0.004	28.09
8.1.24	0.003	0.006	18.86
8.1.23	0.003	0.007	20.36
8.1.4	0.006	0.005	17.43
8.0.17	0.002	0.010	16.89
7.4.28	0.002	0.006	16.49

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