Online PHP editor | perf for sP9s0

@ 2026-01-02T14:30:44Z

<?php

$array = [
    'a',
    'b',
    'c',
];

function insertWhileIteratingForward($arr) {
    foreach ($arr as $index => $value) {
        if ($value === 'a' || $value === 'c') {
            array_splice($arr, $index, 0, ['new', 'new', 'new', 'new', 'new']);
        }
    }

    return $arr;
}

function insertWhileIteratingBackward($arr) {
    for ($index = count($arr) - 1; $index >= 0; --$index) {
        $value = $arr[$index];

        if ($value === 'a' || $value === 'c') {
            array_splice($arr, $index, 0, ['new', 'new', 'new', 'new', 'new']);
        }
    }

    return $arr;
}


var_dump(insertWhileIteratingForward($array));
var_dump(insertWhileIteratingBackward($array));

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)
8.5.9	0.011	0.007	16.75
8.5.8	0.007	0.002	16.93
8.5.7	0.013	0.004	16.58
8.5.6	0.007	0.010	16.75
8.5.5	0.008	0.010	16.49
8.5.3	0.012	0.006	19.47
8.5.2	0.011	0.006	18.09
8.5.1	0.010	0.008	18.75
8.5.0	0.011	0.008	16.71
8.4.24	0.016	0.009	19.47
8.4.23	0.010	0.010	19.58
8.4.22	0.010	0.012	19.49
8.4.21	0.013	0.008	19.41
8.4.18	0.011	0.011	19.39
8.4.17	0.013	0.010	20.54
8.4.16	0.013	0.009	22.04
8.4.15	0.011	0.012	19.72
8.4.9	0.014	0.007	17.91
8.3.32	0.005	0.010	18.54
8.3.31	0.004	0.006	18.55
8.3.30	0.014	0.006	20.69
8.3.29	0.012	0.009	18.59
8.3.28	0.012	0.010	18.56
8.3.18	0.012	0.008	16.61
8.3.5	0.010	0.011	16.61
8.2.32	0.014	0.007	18.02
8.2.31	0.016	0.005	17.95

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