array-vs-spl.php

<?php

function array1($max)
{
    $a = array();

    for ($i = 0; $i < $max; ++$i) {
        $a[$i] = $i;
    }

    for ($i = 0; $i < $max; ++$i) {
        $i = $a[$i];
    }
}

function splarray1($max)
{
    $a = new SplFixedArray($max);

    for ($i = 0; $i < $max; ++$i) {
        $a[$i] = $i;
    }

    for ($i = 0; $i < $max; ++$i) {
        $i = $a[$i];
    }
}
function testall($max, $n, $desc)
{
        echo "Test case: $desc ($n iterations)\n";

        $results = array();

        $start = microtime(true);
        for ($i = 0; $i != $n; ++$i) {
                array1($max);
        }
        $results['array1'] = microtime(true) - $start;

        $start = microtime(true);
        for ($i = 0; $i != $n; ++$i) {
                splarray1($max);
        }
        $results['splarray1'] = microtime(true) - $start;

        showresults($results);
}

function showresults(array $results)
{
        $min = PHP_INT_MAX;
        $minkey = -1;

        foreach ($results as $key => $time) {
                if ($time < $min) {
                        $min = $time;
                        $minkey = $key;
                }
        }

        foreach ($results as $key => $time) {
                echo sprintf("%-20s%-10.5f %s\n", $key, $time, $key === $minkey ? '(fastest)' : '-' . number_format(100 * ($time - $min) / $min, 2) . '%');
        }
}

testall(1000, 20000, 'Size 1000');
testall(100, 20000, 'Size 100');
testall(500, 20000, 'Size 500');
testall(2000, 20000, 'Size 2000');