​x
 
<!DOCTYPE html>
<html>
<body>
​
​
<?php
echo(microtime());
​
​
/**
 * 重复 PHP 5 行为的简单函数
 */
function microtime_float()
{
    list($usec, $sec) = explode(" ", microtime());
    return ((float)$usec + (float)$sec);
}
​
$time_start = microtime_float();
​
// 休息一会儿
usleep(100);
​
$time_end = microtime_float();
$time = $time_end - $time_start;
​
echo "Did nothing in $time seconds\n";
​
?>
​
​
</body>
</html>
​