测试PHP静态方法调用的效率

上篇说了静态方法的使用，在PHP中使用可以使用::调用静态方法和public的非静态函数,其效率不容小觑：

下面是使用pear::benchmark包测试代码：

<?php

set_time_limit(0);
require_once "Benchmark/Timer.php";

class Test {

    function nostat() {
        return 99 * 99;
    }

    static function isstat() {
        return 99 * 99;
    }

    static function stataa() {
        return self::nostat();
    }

    static function statbb() {
        return self::isstat();
    }

}

$timer = new Benchmark_Timer(TRUE);
$timer->start();
$timer->setMarker('startNotStatic');
for ($i = 0; $i < 1000000; $i++) {
    Test::nostat();
}
$timer->setMarker('endNotStatic');

$timer->setMarker('startIsStatic');
for ($i = 0; $i < 1000000; $i++) {
    Test::isstat();
}
$timer->setMarker('endIsStatic');

$timer->setMarker('startstataa');
for ($i = 0; $i < 1000000; $i++) {
    Test::isstat();
}
$timer->setMarker('endstataa');

$timer->setMarker('startstatbb');
for ($i = 0; $i < 1000000; $i++) {
    Test::isstat();
}
$timer->setMarker('endstatbb');

$timer->stop();

$timer->display();

 

测试结果如下

	time index	ex time	%
Start	1294579240.91868900	–	0.00%
startNotStatic	1294579240.91869600	0.000007	0.00%
endNotStatic	1294579243.12920500	2.210509	49.12%
startIsStatic	1294579243.12923000	0.000025	0.00%
endIsStatic	1294579243.88850800	0.759278	16.87%
startstataa	1294579243.88854200	0.000034	0.00%
endstataa	1294579244.64993700	0.761395	16.92%
startstatbb	1294579244.64996500	0.000028	0.00%
endstatbb	1294579245.41862600	0.768661	17.08%
Stop	1294579245.41865800	0.000032	0.00%
total	–	4.499969	100.00%

不使用static关键字比使用效率差3倍!