PHP测试网速

<?php

//$file = fopen(&#39;abc.txt&#39;,&#39;w&#39;);
//for($i=0;$i<170400;$i++) fwrite($file,&#39;helloworld&#39;);
//fclose($file);

$data = file_get_contents(&#39;abc.txt&#39;);
$fsize = filesize("abc.txt")/1024;

$start = gettime();

echo $data;

$end = gettime();

$cs = ($end[&#39;0&#39;]+$end[&#39;1&#39;]) - ($start[&#39;0&#39;]+$start[&#39;1&#39;]);

$speed = round(($fsize / $cs),2);

echo "
network: ".$speed." KB/sec.";


function gettime()
{
return explode(" ",microtime()); 
}