I have been optimizing the performance of PHP programs recently. I will record some things I discovered after testing for future use.
First of all, you need to track and deal with some slow-response operations or pages. You can use webGrind to see where the main problems are.
Secondly, for the optimization of methods, one is to check the optimization of the statements called in the method, and the other is For the optimization of the algorithm of the method itself, the location of the called method is also very important. Generally speaking, calling methods in other files is not as fast as calling methods on this page. If it is a frequently used method and the calling process is more time-consuming, , for performance reasons, this method can be transplanted to this page.
The optimization of the statements in the method body includes the optimization of the called method. For example, it is better to use the statement $a=='' than to use $a.length()==0. The more optimized one is empty($a). When writing code Try to use the method with the best performance, for example: preg_replace is not as good as str_replace, str_replace is not as good as strtr, use strtr for equal length replacement, use str_replace for unequal length replacement. Try to use foreach instead of for for loops to minimize the number of requests to the server. , this depends on javascript compression, css compression, and pictures should be in png format as much as possible. In addition, it is best to use the css method of splitting pictures to load pictures.
Enable whole-site code compression and enable gzip compression
You can consider using some PHP binary code optimization tools, such as xcache to optimize the background code
You can consider using some cutting-edge technologies such as: memcache to store some small strings. This performance is much better than file caching. You can also consider using redias and the like.
If you can't reference external files in the program, don't reference them. Referring to files also takes a certain amount of time. Reference other files as little as possible. In addition, for some branch statements, if they are useless to this branch, you must not let this branch Also visited, this is a waste.
If you really can’t change it, you can consider optimizing the algorithm and framework.

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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