数据库地址为localhost时,导致网站打开很慢TTFB时间很长。
本地网站需要加上解析:
localhost 127.0.0.1
服务器上数据书如果不是真是ip地址建议换成真实ip地址。
描述:网站是php开发的,大部分页面响应很慢。
本地开发时响应速度很快,但是部署到生产环境后大部分响应很慢。
通过谷歌浏览调试发现PHP页面加载很慢,有个别的php请求的响应时间甚至超过10秒,php请求的处理都不是很复杂,不该这么慢。
主要花费的时间全耗在了Waiting(TTFB)上,有的很慢的页面如那个10.2秒的页面,Waiting的时间竟然达到了10秒。
偶然间发现有个别的页面,在不登陆的情况下响应很快,登录后响应很慢,这样的页面特别查看了下,发现登录情况下会执行mysql的select,不登陆则直接显示固定的内容。
因此锁定为在涉及mysq操作时响应速度才很慢。
写了个简单的mysql 的select查询,通过web访问后发现很慢,通过microtime()统计执行时间发现时间是几十毫秒或毫秒级的,但是Waiting的时间仍然是秒级的。这明显的不科学啊,php从开始执行到结束的时间 和 web的响应时间差好几个数量级的。
涉及mysql操作时很慢,但是php本身执行完 mysql操作花费的时间并不慢啊。
弄到这也没啥路子了,只能去搜度娘了,结果还真搜到了,有人也出现一样的情况在度娘上提问了,竟然还有人回答了,突然感觉还是好人多啊。
按回答者的意思是连接数据库时使用的是localhost,但是hosts中没有配置localhost。
去查看hosts了,一看,我去。。。真没有localhost。
添加上
127.0.0.1 localhost
,生成环境下php web访问速度立马给力了。

PHP is mainly procedural programming, but also supports object-oriented programming (OOP); Python supports a variety of paradigms, including OOP, functional and procedural programming. PHP is suitable for web development, and Python is suitable for a variety of applications such as data analysis and machine learning.

PHP originated in 1994 and was developed by RasmusLerdorf. It was originally used to track website visitors and gradually evolved into a server-side scripting language and was widely used in web development. Python was developed by Guidovan Rossum in the late 1980s and was first released in 1991. It emphasizes code readability and simplicity, and is suitable for scientific computing, data analysis and other fields.

PHP is suitable for web development and rapid prototyping, and Python is suitable for data science and machine learning. 1.PHP is used for dynamic web development, with simple syntax and suitable for rapid development. 2. Python has concise syntax, is suitable for multiple fields, and has a strong library ecosystem.

PHP remains important in the modernization process because it supports a large number of websites and applications and adapts to development needs through frameworks. 1.PHP7 improves performance and introduces new features. 2. Modern frameworks such as Laravel, Symfony and CodeIgniter simplify development and improve code quality. 3. Performance optimization and best practices further improve application efficiency.

PHPhassignificantlyimpactedwebdevelopmentandextendsbeyondit.1)ItpowersmajorplatformslikeWordPressandexcelsindatabaseinteractions.2)PHP'sadaptabilityallowsittoscaleforlargeapplicationsusingframeworkslikeLaravel.3)Beyondweb,PHPisusedincommand-linescrip

PHP type prompts to improve code quality and readability. 1) Scalar type tips: Since PHP7.0, basic data types are allowed to be specified in function parameters, such as int, float, etc. 2) Return type prompt: Ensure the consistency of the function return value type. 3) Union type prompt: Since PHP8.0, multiple types are allowed to be specified in function parameters or return values. 4) Nullable type prompt: Allows to include null values and handle functions that may return null values.

In PHP, use the clone keyword to create a copy of the object and customize the cloning behavior through the \_\_clone magic method. 1. Use the clone keyword to make a shallow copy, cloning the object's properties but not the object's properties. 2. The \_\_clone method can deeply copy nested objects to avoid shallow copying problems. 3. Pay attention to avoid circular references and performance problems in cloning, and optimize cloning operations to improve efficiency.

PHP is suitable for web development and content management systems, and Python is suitable for data science, machine learning and automation scripts. 1.PHP performs well in building fast and scalable websites and applications and is commonly used in CMS such as WordPress. 2. Python has performed outstandingly in the fields of data science and machine learning, with rich libraries such as NumPy and TensorFlow.


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