- microtime: documentation ( source)
<?php
$var = null;
$var = new stdClass();
$time = microtime(true);
for ($i = 0; $i <= 1000000; $i++) {
if (!$var) {}
}
$time = microtime(true) - $time;
echo "Time using '!': $time\n";
$time = microtime(true);
for ($i = 0; $i <= 1000000; $i++) {
if ($var === null) {}
}
$time = microtime(true) - $time;
echo "Time using '===': $time\n";