array_map('intval',...) vs arrayToInt()

arrayToInt.php

<?php

$integers = range(100, 1000);

foreach ($integers as &$int) {
    $int = (string)$int;
}

function arrayToInt(array $arr)
{
    foreach ($arr as &$a) {
        $a = (int)$a;
    }
    return $arr;
}

$start = microtime(true);
$sum   = 0;
for ($i = 0; $i < 100000; $i++) {
    $converted = array_map('intval', $integers);
    $sum += array_sum($converted);
}
var_dump($sum);
printf("\n%.6f msec\n", microtime(true) - $start);
flush();

$start = microtime(true);
$sum   = 0;
for ($i = 0; $i < 100000; $i++) {
    $converted = arrayToInt($integers);
    $sum += array_sum($converted);
}
var_dump($sum);
printf("\n%.6f msec\n", microtime(true) - $start);

result.txt

$ php -f arrayToInt.php

31.362757 msec
23.988653 msec

array_map(fn($num) => (int)$num, ['1', '2']);