Online PHP editor | perf for 17XLq

@ 2019-07-12T15:54:13Z

<?php

function returnTime(callable $function)
{
    $count = 100;
    $repeat = 100;

    $tests = [];
    for ($i = 0; $i < $repeat; $i++) {
        $tests[$i] = [];

        for ($i = 0; $i < $count; $i++) {
            $startTime = microtime(true);
            $function();
            $endTime = microtime(true);
            $tests[$i][] = $endTime - $startTime;
        }
    }

    foreach ($tests as &$test)
        $test = array_sum($test);
    return array_sum($tests) / $repeat;
}

function compareResults($result1, $name1, $result2, $name2) {
    $results = [
        $result1,
        $result2,
    ];
    $names = [
        $name1,
        $name2,
    ];

    if ($results[0] == $results[1]) {
        return 0;
    }

    if ($results[0] < $results[1]) {
        $fasterIndex = 0;
    } else {
        $fasterIndex = 1;
    }
    $slowerIndex = 1 - $fasterIndex;
    $fasterResult = $results[$fasterIndex];
    $slowerResult = $results[$slowerIndex];
    
    echo "{$names[$fasterIndex]} performs faster than {$names[$slowerIndex]}.", PHP_EOL;
    echo "It is ", round(($slowerResult / $fasterResult) * 100 - 100), "% faster.", PHP_EOL;
}

// Array with 500000 elements
$array = array_fill(0, 500000, 1);

compareResults(
    returnTime(function () use ($array) {
        end($array);
        $lastKey = key($array);
        reset($array);
    }),
    "end()",

    returnTime(function () use ($array) {
        $lastKey = key(array_slice($array, -1, 1, true));
    }),
    "array_slice()"
);

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)
8.2.11	0.331	0.096	36.25
8.2.0	0.308	0.108	35.41
8.1.24	0.021	0.013	35.59
8.1.11	0.025	0.015	34.72
7.4.4	1.236	0.817	46.75
7.4.3	1.274	0.767	47.00
7.4.2	1.445	0.837	46.67
7.4.1	1.339	0.882	46.83
7.4.0	1.208	0.931	47.03
7.3.16	1.207	0.750	46.59
7.3.15	1.283	0.758	46.91
7.3.14	1.478	0.860	46.85
7.3.13	1.438	0.785	46.75
7.3.12	1.279	0.858	46.83
7.3.11	1.322	0.934	46.96
7.3.10	1.337	0.903	46.64
7.3.9	1.137	0.824	46.85
7.3.8	1.086	0.672	45.79
7.3.7	1.029	0.718	45.54
7.3.6	1.063	0.698	45.53
7.3.5	1.137	0.722	45.50
7.3.4	1.096	0.714	45.54
7.3.3	1.055	0.707	45.57
7.3.2	0.821	0.722	48.51
7.3.1	0.316	0.686	48.49
7.3.0	0.306	0.712	48.30
7.2.29	1.210	0.857	46.99
7.2.28	1.210	0.799	46.85
7.2.27	1.419	0.871	46.96
7.2.26	1.388	0.884	47.02
7.2.25	1.535	0.849	46.96
7.2.24	1.449	0.770	46.92
7.2.23	1.413	0.933	46.91
7.2.22	1.232	0.848	46.95
7.2.21	1.073	0.694	46.02
7.2.20	1.041	0.709	45.90
7.2.19	1.049	0.700	45.75
7.2.18	1.132	0.685	45.67
7.2.17	1.111	0.683	45.84
7.2.16	1.096	0.682	45.74
7.2.15	0.669	0.700	48.77
7.2.14	0.315	0.701	48.89
7.2.13	0.308	0.715	48.84
7.2.12	0.338	0.697	48.79
7.2.11	0.316	0.713	48.77
7.2.10	0.305	0.690	48.84
7.2.9	0.307	0.737	48.98
7.2.8	0.375	0.777	48.84
7.2.7	0.385	0.733	48.72
7.2.6	0.468	0.763	48.76
7.2.5	0.433	0.738	48.84
7.2.4	0.322	0.724	48.92
7.2.3	0.332	0.671	48.80
7.2.2	0.325	0.693	48.95
7.2.1	0.309	0.701	48.67
7.2.0	0.360	0.704	48.93
7.1.33	1.812	0.567	47.33
7.1.32	1.726	0.712	47.61
7.1.31	2.051	0.357	45.56
7.1.30	1.536	0.397	46.05
7.1.29	1.560	0.470	46.11
7.1.28	1.360	0.640	46.90
7.1.27	0.701	0.714	47.68
7.1.26	0.316	0.704	47.56
7.1.25	0.291	0.719	47.76

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