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<!DOCTYPE html>
<html>
<body>
<?php
echo(microtime());
/**
 * Simple function to replicate PHP 5 behaviour
 */
function microtime_float()
{
    list($usec, $sec) = explode(" ", microtime());
    return ((float)$usec + (float)$sec);
}
$time_start = microtime_float();
// Sleep for a while
usleep(100);
$time_end = microtime_float();
$time = $time_end - $time_start;
echo "Did nothing in $time seconds\n";
?>
</body>
</html>
0.71693900 1590577473Did nothing in 0.00018405914306641 seconds