PHP include vs include_once(速度) [英] PHP include vs include_once (speed)

问题描述

可能重复:
为什么require_once不好用?

Possible Duplicate:
Why is require_once so bad to use?

我在某处读到，PHP中的include_once和require_once语句比它们的非一次性语句慢.这是一个显着的放缓吗?是否对此进行了任何测试或研究，并且在最新版本的PHP中进行了更改?

I've read somewhere that the include_once and require_once statements in PHP were slower than their non-once counterparts. Is this a significant slowdown? Has there been any testing or studies of this, and has it changed in recent versions of PHP?

推荐答案

速度提高极小，并且进行了参考检查以防止代码重复. 一次"附件是对同一代码被执行/包含两次的预防措施.执行此检查的代价是较小的代价.

The speed increase is minimal and comes as a reference check is conducted to prevent code duplication. The 'once' appendage is a preventative measure against the same code being executed/included twice..this performing this check comes at a minor speed cost.

如果曾经有一个实例在使用_once，请查看为什么是这种情况，您是否真的以最有效的方式构建了代码?通常最好是不再需要依赖_once并产生更好的代码(说起来容易做起来难！).

If there is ever an instance where you are using _once look into why it is the case, is you code really built in the most efficient way? It is often better to remove the need to rely on _once and produce better code (easier said than done!).

请参阅:

http://forums.digitalpoint.com/showthread.php?t=1693837

http://www.phpbb.com/community/viewtopic.php?f = 71& t = 565933

http://www.sitepoint.com/forums/showthread.php? t = 269085

http://www.quora.com/What-is-the-difference-between-functions-include-and-include_once-in-PHP

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