TYPO3 GeneralUtility::intExplode() performance test

gistfile1.txt

<?php

// Current intExplode function in v13
function intExplodeOld($delimiter, $string, $removeEmptyValues = false)
{
    $result = explode($delimiter, $string);
    foreach ($result as $key => &$value) {
        if ($removeEmptyValues && trim($value) === '') {
            unset($result[$key]);
        } else {
            $value = (int)$value;
        }
    }
    unset($value);

    /** @var array<int, int> $result */
    return $result;
}

// New intExplode function refactored to use `array_filter` and `array_walk`
function intExplodeNew($delimiter, $string, $removeEmptyValues = false)
{
    $result = explode($delimiter, $string);

    if ($removeEmptyValues) {
        $result = array_filter($result, static function (mixed $value): bool {
            return trim($value) !== '';
        });
    }

    array_walk($result, static function (mixed &$value): void {
        $value = (int)$value;
    });

    // This is faster as `array_walk`, but still a factor ~3 slower than the original
    // $result = array_map(intval(...), $result);

    /** @var array<int, int> $result */
    return $result;
}


$stringToExplode = '';
for ($i = 1; $i <= 1000000; $i++) {
    $stringToExplode .= $i . ',';
}

$timeStart = microtime(true);
intExplodeOld(',', $stringToExplode, true);
$timeEnd = microtime(true);
$executionTime = $timeEnd - $timeStart;
echo('Old: ' . $executionTime . PHP_EOL);

$timeStart = microtime(true);
intExplodeNew(',', $stringToExplode, true);
$timeEnd = microtime(true);
$executionTime = $timeEnd - $timeStart;
echo('New: ' . $executionTime . PHP_EOL);