Array merge benchmark

array_benchmark.php

<?php

/*
$ php ~/test.php
Runs: 100,000

Benchmark  Avg (s)    Total (s)
---------- ---------- ----------
       sum   0.000006   0.597605
     merge   0.000007   0.713410
*/

$count = 100000;

timethem(array(
    'sum' => function() {
        return array('q' => null) + array('q' => '/123', 'p' => 'test');
    },
    'merge' => function() {
        return array_merge(
            array('q' => '/123', 'p' => 'test'),
            array('q' => null)
        );
    },
), $count);

function timethem(array $tests, $count)
{
    echo 'Runs: ', number_format($count), "\n\n";
    echo sprintf("%-10s %-10s %-10s\n", 'Benchmark', 'Avg (s)', 'Total (s)');
    echo sprintf("%'-10s %'-10s %'-10s\n", '', '', '');

    foreach ($tests as $name => $test) {
        list($total, $avg) = timeit($test, $count);
        echo sprintf(
            "%10s %10f %10f\n",
            $name, $avg, $total
        );
    }
}

function timeit($test, $count)
{
    $start = microtime(true);

    for ($i = 0; $i < $count; $i++) {
        call_user_func($test);
    }

    $total = microtime(true) - $start;
    return array($total, $total / $count);
}