比如用户发一个帖子要先上传图片(文件是保存在七牛这类第三方平台,用户上传成功后会向数据库里写一条记录的),当用户把图片上传完成后,用户突然不想发帖了,直接关掉了浏览器。结果导致用户刚刚上传的图片成为垃圾。
请问,我该怎么设置数据库 逻辑,当用户上传的文件没被使用时,后台直接清除掉文件
回复内容:
比如用户发一个帖子要先上传图片(文件是保存在七牛这类第三方平台,用户上传成功后会向数据库里写一条记录的),当用户把图片上传完成后,用户突然不想发帖了,直接关掉了浏览器。结果导致用户刚刚上传的图片成为垃圾。
请问,我该怎么设置数据库 逻辑,当用户上传的文件没被使用时,后台直接清除掉文件
我看不下去了,
说方法吧,不管最后发不发帖,都将上传对应的图片id存到数据库,只是该图片的对应帖子id为空或者0,查询距当前时间一小时((时间自己决定)),若没有对应的就认为他垃圾图片,调用七牛接口删除,删除数据库记录
若发帖了就标记对应的帖子id
方法很多啊,个人认为最简单的做发是,在发贴成功前,图片先存临时文夹,或做临时文件标识,发贴成功后才把图片移动到相应文件夹或去除临时文件标识,这样,定时去删除临时文件就好了,
没有用数据库保存过文件,说下目录保存文件,比如form表单上传文件上传后文件会保存在系统临时目录,之后一般会移动到Web下的文件目录,所以你可以再分一个目录当作永久目录,对于保存的将文件移动到永久目录,临时目录定时清理就OK。对于数据库存文件,form上传后仍然会保持在系统临时目录,你可以将文件移动到一个临时存储表或者临时目录,保持成功再移动到永久存储表/目录,再定时清理临时表/目录。这样你其实有3个地方存储:系统临时目录,临时目录/临时表,永久目录/永久表,再省事的方法就是只用系统临时目录+永久目录/永久表,上次后文件在系统临时目录,只记录个路径,保持后移动到永久目录/永久表,不保存的定时清理。
其实php上传的文件一开始是保存到了系统临时目录里的。你不去动它就好了。
或者你需要:
http://php.net/manual/zh/function.tempna...
这个函数会在临系统时目录生成一个能使用的临时文件。
七牛官方多媒体静态资源的处理还是建议使用js sdk的方式上传,可以减少服务器端的处理,只需要记住文件上传后的几个基本信息即可,非常省事,性能当然也是目前最佳选择。安全性不用担心,请参考文档,并做好js跨域控制。关注「phpgod」PHP技术大全,成就大神就不远。

PHP remains important in modern web development, especially in content management and e-commerce platforms. 1) PHP has a rich ecosystem and strong framework support, such as Laravel and Symfony. 2) Performance optimization can be achieved through OPcache and Nginx. 3) PHP8.0 introduces JIT compiler to improve performance. 4) Cloud-native applications are deployed through Docker and Kubernetes to improve flexibility and scalability.

PHP is suitable for web development, especially in rapid development and processing dynamic content, but is not good at data science and enterprise-level applications. Compared with Python, PHP has more advantages in web development, but is not as good as Python in the field of data science; compared with Java, PHP performs worse in enterprise-level applications, but is more flexible in web development; compared with JavaScript, PHP is more concise in back-end development, but is not as good as JavaScript in front-end development.

PHP and Python each have their own advantages and are suitable for different scenarios. 1.PHP is suitable for web development and provides built-in web servers and rich function libraries. 2. Python is suitable for data science and machine learning, with concise syntax and a powerful standard library. When choosing, it should be decided based on project requirements.

PHP is a scripting language widely used on the server side, especially suitable for web development. 1.PHP can embed HTML, process HTTP requests and responses, and supports a variety of databases. 2.PHP is used to generate dynamic web content, process form data, access databases, etc., with strong community support and open source resources. 3. PHP is an interpreted language, and the execution process includes lexical analysis, grammatical analysis, compilation and execution. 4.PHP can be combined with MySQL for advanced applications such as user registration systems. 5. When debugging PHP, you can use functions such as error_reporting() and var_dump(). 6. Optimize PHP code to use caching mechanisms, optimize database queries and use built-in functions. 7

The reasons why PHP is the preferred technology stack for many websites include its ease of use, strong community support, and widespread use. 1) Easy to learn and use, suitable for beginners. 2) Have a huge developer community and rich resources. 3) Widely used in WordPress, Drupal and other platforms. 4) Integrate tightly with web servers to simplify development deployment.

PHP remains a powerful and widely used tool in modern programming, especially in the field of web development. 1) PHP is easy to use and seamlessly integrated with databases, and is the first choice for many developers. 2) It supports dynamic content generation and object-oriented programming, suitable for quickly creating and maintaining websites. 3) PHP's performance can be improved by caching and optimizing database queries, and its extensive community and rich ecosystem make it still important in today's technology stack.

In PHP, weak references are implemented through the WeakReference class and will not prevent the garbage collector from reclaiming objects. Weak references are suitable for scenarios such as caching systems and event listeners. It should be noted that it cannot guarantee the survival of objects and that garbage collection may be delayed.

The \_\_invoke method allows objects to be called like functions. 1. Define the \_\_invoke method so that the object can be called. 2. When using the $obj(...) syntax, PHP will execute the \_\_invoke method. 3. Suitable for scenarios such as logging and calculator, improving code flexibility and readability.


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