- microtime: documentation ( source)
<?php
$times = 10000;
$var = null;
$var = new stdClass();
$time1 = microtime(true);
for ($i = 0; $i <= $times; $i++) {
if (!$var) {}
}
$time1 = microtime(true) - $time1;
//echo "Time using '!': $time1\n";
$time2 = microtime(true);
for ($i = 0; $i <= $times; $i++) {
if ($var === null) {}
}
$time2 = microtime(true) - $time2;
//echo "Time using '===': $time2\n";
if ($time1 > $time2)
echo "'===' was faster by {($time1-$time2)/$time2}%";
else
echo "'!' was faster by {($time2-$time1)/$time1}%";