php获取目标函数执行时间示例_php实例
写了一个类用来测试目标函数的执行时间。以下是类的定义代码:
/**
* class EfficiencyTester
* 效率测试器,测试函数的运行时间
* @version 1.0 2013.04.13
* @author Kross
*/
class EfficiencyTester {
/**
* var $testTimes
* 测试的次数
*/
private $testTimes = 1000;
/**
* function getTime()
* 根据时间模式,获取时间戳
* @param $timeModel 时间模式,默认:微秒
* @return int 时间戳
*/
private function getTime($timeModel = 'MS') {
if ($timeModel == 'MS') {
return microtime();
} else if ($timeModel == 'S') {
return time();
} else {
return microtime();
}
}
/**
* function testOnce()
* 测试目标函数一次,返回运行时间
* @param $functionName 目标函数名
* @param $timeModel 时间模式,默认:微秒
* @return double 目标函数运行一次的时间(很随机)
*/
public function testOnce($functionName, $timeModel = 'MS') {
$startMicroTime = $this->getTime($timeModel);
$functionName();
$endMicroTime = $this->getTime($timeModel);
$costMicroTime = $endMicroTime - $startMicroTime;
return $costMicroTime;
}
/**
* function test()
* 测试目标函数多次,返回运行时间(平均值)
* @param $functionName 目标函数名
* @param $timeModel 时间模式,默认:微秒
* @return double 目标函数运行的时间
*/
public function test($functionName, $timeModel = 'MS') {
$totalMicroTimes = 0;
for ($i = 1; $i testTimes; $i++) {
$totalMicroTimes += $this->testOnce($functionName);
}
return $totalMicroTimes / $this->testTimes;
}
}
?>
以下是类的测试代码:
require_once('../class/EfficiencyTester.class.php');
$e = new EfficiencyTester();
echo $e->test('rand');
?>
一开始我是直接使用 microtime() 获取时间的,后来考虑到如果想获得单位是秒的运行时间,这样写就不够多态了,然后我就写了一个getTime() 的函数来获取不同单位的时间戳,不过这样,貌似目标函数的运行时间变长了,可能是因为 getTime() 函数中的判断占用了一部分时间。

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