bench_count.php

<?php

runs(array(1, 1, 10, 100, 1000, 10000, 100000, 1000000), array(
    '$count' => function () {
        $data = range(1, 25);

        for ($i = 0, $count = count($data); $i < $count; $i++) {
            $data[$i];
        }
    },
    'count()' => function () {
        $data = range(1, 25);

        for ($i = 0; $i < count($data); $i++) {
            $data[$i];
        }
    },
));

function runs($counts, $functions, $interbal=null)
{
    foreach ($counts as $count) {
        echo "$count\n";
        run($count, $functions, $interbal);
    }
}

// See Also: http://d.hatena.ne.jp/do_aki/20100202/1265126448
function run($cnt, $functions, $interbal=null)
{
    $times = array();
    foreach ($functions as $name => $func) {
        $t = microtime(true);
        for($i=0;$i<$cnt;++$i) { $func(); }
        $t = microtime(true) - $t;
        $times[$name] = $t;

        if ($interbal) {
            $interbal();
        }
    }

    $min = min($times);
    if (0 == $min) {
        echo "failed estimate ...\n";
        return;
    }

    foreach($times as $test_name => $time){
        $par = ($time/$min)*100;
        $unit = $time / $cnt;

        printf("%-16s: %10s sec %10s sec (%0.2f%%)\n"
            , $test_name
            , sprintf("%-0.4f", $time)
            , sprintf("@ %-0.4f", $unit)
            , $par);
    }
}