PHP中的clone和new性能比较（代码示例）

<?php
define(&#39;TEST_COUNT&#39;, 10000);
  
function test($name, $callable)
{
    $time = microtime(true);
    $callable();
    echo $name, &#39; time: &#39;, microtime(true) - $time, &#39;s&#39;, PHP_EOL;
}
// 空的类 
class A
{
     
} 
function test1()
{
    echo &#39;空的类:&#39;, PHP_EOL;
    $a = new A;
    test(&#39;A clone&#39;, function() use($a){
        for($i = 0; $i < TEST_COUNT; ++$i)
        {
            $obj = clone $a;
        }
    });
    test(&#39;A new&#39;, function(){
        for($i = 0; $i < TEST_COUNT; ++$i)
        {
            $obj = new A;
        }
    });
    $serialize = serialize($a);
    test(&#39;A unserialize&#39;, function() use($serialize){
        for($i = 0; $i < TEST_COUNT; ++$i)
        {
            $obj = unserialize($serialize);
        }
    });
} 
test1(); 
// 带构造方法、属性的类 
class B
{
    public $data;
 
    public function __construct($data)
    {
        $this->data = $data;
    }
} 
function test2()
{
    echo &#39;带构造方法、属性的类:&#39;, PHP_EOL;
    $constructData = [
        &#39;id&#39;            =>  1,
        &#39;name&#39;          =>  &#39;imi 框架牛逼&#39;,
        &#39;description&#39;   =>  &#39;IMI 是一款基于 Swoole 开发的协程 PHP 开发框架，拥有常驻内存、协程异步非阻塞IO等优点。&#39;,
        &#39;url&#39;           =>  &#39;https://www.imiphp.com&#39;,
    ];
    $a = new B($constructData);
    test(&#39;B clone&#39;, function() use($a){
        for($i = 0; $i < TEST_COUNT; ++$i)
        {
            $obj = clone $a;
        }
    });
    test(&#39;B new&#39;, function() use($a){
        for($i = 0; $i < TEST_COUNT; ++$i)
        {
            $obj = new B($a->data);
        }
    });
    $serialize = serialize($a);
    test(&#39;B unserialize&#39;, function() use($serialize){
        for($i = 0; $i < TEST_COUNT; ++$i)
        {
            $obj = unserialize($serialize);
        }
    });
} 
test2();

A clone time: 0.0015249252319336s
A new time: 0.00090503692626953s
A unserialize time: 0.005108118057251s

B clone time: 0.00072503089904785s
B new time: 0.0015559196472168s
B unserialize time: 0.0084571838378906s