如何在PHP中实现汇率？ [英] How to implement exchange rate in PHP?

问题描述

他们是否硬编码率或每次查找？

解决方案

一个想法是：

• 定期调用一些外部API，总是有一些新鲜汇率（我不知道这可以改变多久），但每隔几分钟就可以查看一次费用）
  
  
  
  
  • 这可以通过某种cron工作完成，独立于使用此汇率的网络应用程序
  
  


• 将汇率保持在缓存中几分钟：
  
  
  
  
  • 所以你不要频繁调用外部API
  
  
  • ，不要太依赖它（例如，如果您提取速率的网站已经停了几分钟，您的网站仍然可以工作，如果需要时间来获取该数据，它不会减慢您的网站，因为它是由cron工作定期获取）
  
  

How does major sites implement this?

Do they hardcode the rate or look it up each time?

解决方案

An idea would be :

• to call some external API regularly, to always have some fresh exchange rate (I don't know how often this can change -- but looking the rate up once every couple of minutes should do)
  • This could be done via some sort of cron job, independantly of your web-application that uses this exchange rate
• and to keep the exchange rate in cache for a couple of minutes :
  • so you don't call the external API too often
  • and don't rely on it too much (i.e. your site will still work if the site you're fetching the rate from is down for a couple of minutes -- and if it takes time to fetch that data, it won't slow your website down, as it's fetched regularly by a cron job)

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