Time logging

markTime.php

<?php

function markTime($label){
    static $points = [];
    static $firstRun = true;

    if ($firstRun){
        $firstRun = false;
        register_shutdown_function(function () use (&$points){
            $firstPoint = reset($points);
            $lastPoint = end($points);

            $firstTime = $firstPoint[1];
            $lastTime = $lastPoint[1];

            printf("<div class=\"timerBlock\" onclick=\"this.className += ' show';\">\r\n");
            printf("\t<p>Total Time: %0.3f seconds; Points: %d</p>", $lastTime - $firstTime, count($points));
            printf("\t<p>Points:</p>\r\n<ol>\r\n");
            $previousPoint = null;
            foreach ($points as $p){
                printf("<li>%s: ", $p[0]);
                printf("<span title=\"Since Start\">%0.3fs</span> ",
                    $p[1] - $firstTime
                );
                printf("<span title=\"Since previous\">(%0.3fs)</span>",
                    ($previousPoint) ? $p[1] - $previousPoint[1] : '-'
                );
                $previousPoint = $p;
                printf("</li>\r\n");
            }
            printf("</ol></div>");
        });
    }

    $points[] = [$label, microtime(1)];
}

$iterations = 1000000;
$benchResult = [];
$n = 562;

markTime('Start');
for ($i = 0; $i < $iterations; $i++){
    $result = floor($n / 10) * 10;

}
markTime('Method A');

for ($i = 0; $i < $iterations; $i++){
    $result = round($n - 5, -1);
}
markTime('Method B');

for ($i = 0; $i < $iterations; $i++){
    $result = $n - ($n % 10);
}
markTime('Method C');