php使用魔法函数和不使用魔法函数比较

/**
* use magic 0.31868386268616s
* not use magic 0.11876797676086s
*/
class Test {
    private $varstr = "123";

    function __get($name) {
        return $this->varstr;
    }
}

function microtime_float()
{
    list($usec, $sec) = explode(" ", microtime());
    return ((float)$usec + (float)$sec);
}

$time_start = microtime_float();

$i = 0;
while ($i<100000) {
    $i++;
    $t = new Test();
    $t->varstr;
}

$time_end = microtime_float();
$time = $time_end - $time_start;

echo "Did nothing in $time seconds\n";