Question

想知道以下方法之间的性能有何不同。

// in dependencies.php
$greeting=function(){echo "lambda";};

// in MyClass.php
class MyClass{
 function greeting(){echo "class";}
}

// in index.php
include dependencies.php
include MyClass.php

....
// assume using Slim or Laravel routing. 
$app->get('/test1', $greeting);
$app->get('/test2', 'MyClass:greeting');
$app->get('/test3', function(){ echo "anonymous"; });

哪种方法是最好的表现？为什么？

Answer 1

您可以使用它来查看运行每个脚本所需的费用

$start =  microtime(true);
$app->get('/test1', $greeting); // replace this one with each of the others
$end = microtime(true);
echo $end-$start; // microseconds

关于记忆：

echo memory_get_usage() . "\n"; 
$app->get('/test1', $greeting); // replace this one with each of the others
echo memory_get_usage() . "\n";

但我相信你能找到合适的基准测试库。

在我个人看来，班级方法可能会变得最慢。这可能是由于大型__constructor或__destructor实施。

Answer 2

我试过这个

// in dependencies.php
$greeting=function(){echo "lambda";};
$greeting2=function(){echo "lambda2";};

// in MyClass.php
class MyClass{
 function greeting(){echo "class";}
}

// in MyClass2.php
class MyClass2{
 function greeting(){echo "class2";}
}

// in index.php
include dependencies.php
include MyClass.php
include MyClass2.php

....
// I test this with Slim3 framework
$app->get('/test1', $greeting);
$app->get('/test2', $greeting2);
$app->get('/test3', 'MyClass:greeting');
$app->get('/test4', 'MyClass2:greeting');
$app->get('/test5', function(){ echo "anonymous"; });

The results:

test1 0.0031208992004395
test2 1.8119812011719E-5
test3 1.0967254638672E-5
test4 1.0013580322266E-5
test5 1.0967254638672E-5

then i tried different sequences, here the results:

test1 0.0039870738983154
test3 1.9073486328125E-5
test2 1.5020370483398E-5
test4 1.0967254638672E-5
test5 1.215934753418E-5

test1 0.004763126373291
test5 2.1934509277344E-5
test3 1.1920928955078E-5
test2 1.0967254638672E-5
test4 1.0013580322266E-5

test5 0.0038559436798096
test1 2.0027160644531E-5
test3 1.2874603271484E-5
test2 1.1920928955078E-5
test4 1.0967254638672E-5

在这个简单的实现中，看起来无论是lambda，object还是匿名都无关紧要。

哪个最好？ PHP lambda vs类对象方法

2 个答案: