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PHP __autoload()方法真的影响性能吗?_php技巧

WBOY
Release： 2016-05-17 09:11:50
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介绍

对于php性能问题，议论最多的就是__autoload()方法，很多人提到这个方法非常影响性能。还有人说opcode也能影响到__autoload()方法，所以针对这两点我做了个测试。
最终发现__autoload方法在性能方面的影响不是很大的。

环境

PHP:5.3.9 ——以fastcgi模式启动
Nginx:1.1.12
eaccelerator:0.9.6.1

。
 
最终发现__autoload方法在性能方面的影响不是很大的。

 环境
 
 PHP:5.3.9 ——以fastcgi模式启动
 Nginx:1.1.12
 eaccelerator:0.9.6.1
 
截图:

 启动界面:

 eAccelerator(在php.ini文件中)配置情况:

  文件结构:(每一个Test文件都是6000多行代码的文件）

 测试:带着eAccelerator缓存进行测试
 
测试代码:经过__autoload加载

 

       图1

我在浏览器里通过刷新得到的结果分别如下:
Total Time:0.10401391983032
Total Time:0.10252094268799
Total Time:0.095267057418823
Total Time:0.10013008117676
Total Time:0.096842050552368
Total Time:0.097998142242432
Total Time:0.10348510742188
Total Time:0.096648931503296
 
测试：不经过__autoload()

                         图2

测试结果——通过刷浏览器
Total Time:0.10309100151062
Total Time:0.10285210609436
Total Time:0.10154414176941
Total Time:0.097845792770386
Total Time:0.099545001983643
Total Time:0.10166597366333
 
最终看到的结果：autoload方法没有出现明显的性能下降
 
 测试:取消eAccelerator缓存进行测试
 
 图1的测试结果
Total Time:0.24992394447327
Total Time:0.25681900978088
Total Time:0.25327301025391
Total Time:0.22580695152283
Total Time:0.22656512260437
Total Time:0.22530484199524
Total Time:0.23080611228943
 
 图2的测试结果
Total Time:0.23054909706116
Total Time:0.22633790969849
Total Time:0.23442888259888
Total Time:0.2350070476532
Total Time:0.22897601127625
Total Time:0.23207712173462

 __autoload()方法在性能上还是没有明显的影响。

 总结
 
通过上面的两组实验得出：
1>__autoload方法没有明显的性能损失。所以大家不要介于使用__autoload方法。
2>opcode对代码的影响是比较大的，明显使用opcode的时候，php代码执行速度提高了将近2倍多。
Related labels：
__autoload
source：php.cn
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