SplFixedArray vs Native Array lookup performance

gistfile1.aw

<?php

ini_set('memory_limit', -1);

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

function fixed_array_search_foreach($stack, $counter, $lookup, $type) {
    $start = microtime(true);
    foreach ($stack as $key => $value) {
        if ($lookup === $value) {
            $counter[$key] = 1 + $counter[$key];
            break;
        }
    }
    $end = microtime(true);
    printf("FixedArray \tForeach\t%s%s\t: %.6f\n", $type, str_repeat(' ', 15-strlen($type)), $end-$start);

    return $end-$start;
}

function fixed_array_search_native($stack, $counter, $lookup, $type) {
    $start = microtime(true);
    if (false !== ($key = array_search($lookup, $stack->toArray()))) {
        $counter[$key] = 1 + $counter[$key];
    }
    $end = microtime(true);
    printf("FixedArray \tNative\t%s%s\t: %.6f\n", $type, str_repeat(' ', 15-strlen($type)), $end-$start);

    return $end-$start;
}

function array_search_foreach($stack, $lookup, $type) {
    $start = microtime(true);
    foreach ($stack as $key => $value) {
        if ($lookup === $key) {
            ++$stack[$key];
            break;
        }
    }
    $end = microtime(true);
    printf("Array      \tForeach\t%s%s\t: %.6f\n", $type, str_repeat(' ', 15-strlen($type)), $end-$start);

    return $end-$start;
}

function array_search_native($stack, $lookup, $type) {
    $start = microtime(true);
    if (false !== ($key = array_search($lookup, array_keys($stack)))) {
        ++$stack[$lookup];
    }
    $end = microtime(true);
    printf("Array      \tNative\t%s%s\t: %.6f\n", $type, str_repeat(' ', 15-strlen($type)), $end-$start);

    return $end-$start;
}

$fixedArray = new SplFixedArray($count);
$counter = new SplFixedArray($count);
for ($i = 0; $i < $count; ++$i) {
    $fixedArray[$i] = rand(0,255) . '.' . rand(0,255) . '.' . rand(0,255) . '.' . rand(0,255);
    $counter[$i] = rand(0, 20);
}

fixed_array_search_foreach($fixedArray, $counter, $fixedArray[0], 'first');
fixed_array_search_foreach($fixedArray, $counter, end($fixedArray), 'last');
fixed_array_search_foreach($fixedArray, $counter, 'inexistant', 'inexistant');

fixed_array_search_native($fixedArray, $counter, $fixedArray[0], 'first');
fixed_array_search_native($fixedArray, $counter, end($fixedArray), 'last');
fixed_array_search_native($fixedArray, $counter, 'inexistant', 'inexistant');

unset($fixedArray, $counter, $keys);

$array = array();
for ($i = 0; $i < $count; ++$i) {
    $key = rand(0,255) . '.' . rand(0,255) . '.' . rand(0,255) . '.' . rand(0,255);
    $array[$key] = rand(0, 20);
}

$keys = array_keys($array);
array_search_foreach($array, $keys[0], 'first');
array_search_foreach($array, end($keys), 'last');
array_search_foreach($array, 'inexistant', 'inexistant');

array_search_native($array, $keys[0], 'first');
array_search_native($array, end($keys), 'last');
array_search_native($array, 'inexistant', 'inexistant');

unset($array, $keys);

Thanks.