Array vs SplFixedArray: creation time

array_vs_splfixedarray_creation_time.php

<?php

$sizes = [];
for ($exp = 0; $exp < 10; $exp++) {
    $sizes[] = pow(2, $exp) * 1000;
}

echo "size, timeArray, timeSpl" . PHP_EOL;

foreach ($sizes as $size) {
    $startTime = microtime(true);
    createOrdinaryArray($size);
    $stopTimeOrdinary = (microtime(true) - $startTime) * 1000;
    
    $startTime = microtime(true);
    createSplArray($size);
    $stopTimeSpl = (microtime(true) - $startTime) * 1000;
    
    echo "{$size}, {$stopTimeOrdinary}, {$stopTimeSpl}" . PHP_EOL;
}


function createOrdinaryArray(int $size)
{
    $array = [];
    for ($i = 0; $i < $size; $i++) {
        $array[$i] = null;
    }
}

function createSplArray(int $size)
{
    $array = new SplFixedArray($size);
    for ($i = 0; $i < $size; $i++) {
        $array[$i] = null;
    }
}

Result: https://docs.google.com/spreadsheets/d/1CvYtz40_HWFU_1ZMbzQQM5hykwD7hXPz8joTC8tCKgQ/edit#gid=0