Se basa en cargar 512 Kb de comentarios en HTML y luego a partir del tiempo tardado, calcula la velocidad.
<?php
if ($_GET['source'])
{
highlight_file($_SERVER['SCRIPT_FILENAME']);
exit;
}
$maxNumKB = 4096;
$defNumKB = 512;
if (!isset($_GET['numKB']) || intval($_GET['numKB']) > $maxNumKB)
{
header("Location: http://{$_SERVER['HTTP_HOST']}{$_SERVER['PHP_SELF']}?numKB=$defNumKB");
}
$numKB = intval($_GET['numKB']);
?>
<!DOCTYPE html
PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
<head>
<title>Jan! » PHP » speed test</title>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<style type="text/css">
<!--
html
{
font-family: sans-serif;
color: #000;
background: #fff;
}
*
{
font-size: medium;
}
#wait
{
border-bottom: thin dotted black;
}
#wait abbr
{
border: none;
}
#done
{
font-weight: bold;
}
#benchmark
{
padding: 1em;
border: 1px solid black;
background: #ffe;
color: #000;
}
//-->
</style>
</head>
<body>
<div id="benchmark">
<p>
<strong>This not a script to benchmark or determine the execution speed
of PHP scripts.</strong> If you're looking for one, check out the PEAR
<a href="http://pear.php.net/package/Benchmark">Benchmark package</a>.
</p>
<p>
This script sends <?php echo $numKB; ?> <abbr title="kilobyte">KB</abbr>
of HTML comments to your client. Parsing that HTML may add to the total
transfer time, so don't take this as your raw download speed.
</p>
</div>
<h1>Please wait</h1>
<p>
<a href="<?php echo "http://{$_SERVER['HTTP_HOST']}{$_SERVER['PHP_SELF']}?source=1"; ?>">(Show source)</a>
</p>
<p id="wait">
Transferring <?php echo $numKB; ?> <abbr title="kilobyte">KB</abbr>
</p>
<!--
<?php
function getmicrotime()
{
list($usec, $sec) = explode(" ", microtime());
return ((float)$usec + (float)$sec);
}
flush();
$timeStart = getmicrotime();
$nlLength = strlen("\n");
for ($i = 0; $i < $numKB; $i++)
{
echo str_pad('', 1024 - $nlLength, '/*\\*') . "\n";
flush();
}
$timeEnd = getmicrotime();
$timeDiff = round($timeEnd - $timeStart, 3);
?>
-->
<p id="done">
<?php
echo "Transferred {$numKB} <abbr title=\"kilobyte\">KB</abbr> in {$timeDiff} seconds, " .
($timeDiff <= 1 ? "more than {$numKB}" : round($numKB / $timeDiff, 3)) .
' <abbr title="kilobytes per second">KB/s</abbr>';
?>
</p>
</body>
</html>
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