Associative Array methods profiling

index.php

<?php

// Code referenced from https://gist.github.com/Thinkscape/1965669

if (!isset($argv[1])) {
    echo "Usage: " . $argv[0] . " (number of iterations)\n";
    exit(1);
}

$tests = [
    [
        [
            'foo' => 'bar',
        ],
    ],
    [
        [
            'bar',
            'foo' => 'bar',
            'baz',
        ],
    ],
    [null],
    [true],
    [false],
    [0],
    [1],
    [0.0],
    [1.0],
    ['string'],
    [
        [0, 1, 2],
    ],
    [new stdClass],
    array_fill(0, 1000, uniqid()),                 // big numeric array
    array_fill_keys(range(2, 1000, 3), uniqid()),  // big misaligned numeric array (=associative)
    array_fill_keys(                                             // big associative array
        str_split(
            str_repeat(uniqid('', true), 100),
            3
        ),
        true
    ),
];

$iterations = (int) $argv[1];

$methods = [
    'method1 (array_values check)' =>
        function ($array) {
            return (array_values($array) !== $array);
        },

    'method2 (array_keys comparison)' =>
        function ($array) {
            $array = array_keys($array);
            return ($array !== array_keys($array));
        },

    'method3 (array_filter of keys)' =>
        function ($array) {
            return count(array_filter(array_keys($array), 'is_string')) > 0;
        },
    'method4 (appkr)' =>
        function ($array) {
            return array_keys($array) !== range(0, count($array) - 1);
        },
];

foreach ($methods as $name => $func) {
    echo "Testing $name - $iterations iterations\n";
    $time = microtime(true);

    for ($x = 0; $x < $iterations; $x++) {
        foreach ($tests as $array) {
            $func($array);
        }
    }

    $totalTime = (microtime(true) - $time);
    $avgTime = $totalTime / ($iterations * count($tests));
    $memoryUsageAtEachTurn[] = memory_get_usage() / 1000000;
    $avgMemoryUsage = array_sum($memoryUsageAtEachTurn) / count($memoryUsageAtEachTurn);

    echo "  Total time: " . number_format($totalTime, 5, '.', ' ') . " s\n";
    echo "  Average   : " . number_format($avgTime * 1000, 5, '.', ' ') . " ms / test \n";
    echo "  Memory usage   : " . number_format($avgMemoryUsage, 5, '.', ' ') . " Mbytes / test \n";
    echo "\n";
}