


PHP performance optimization - PHP language-level performance optimization - PHP tutorial
php performance optimization php language-level performance optimization 1
For this problem, first we need to know what is the reason that affects the performance of php? That is
1 Under what circumstances will PHP performance problems occur?
1php Improper use of syntax (including some businesses that can be processed using PHP’s own functions)
2 Use php language to do things it is not good at
3 The server connected using php language is not powerful (of course, if it is localhost, your local configuration is relatively poor, it is recommended to change it, haha)
4php’s own shortcomings (PHP itself can’t do it)
5 Questions We Don’t Know (囧)
2 Introduction to PHP performance issues and solutions to PHP performance issues
From the least difficult to the most difficult are:
1 Php language level performance optimization
2 Performance optimization of Php peripheral issues (such as mysql nginx|apache)
3 Php language senior analysis and optimization (ps mainly refers to the underlying c code)
The following is an example discussion of PHP language-level performance optimization, and a test of the content mentioned in the title. Next, we need to write two files bad.php, goods.php
What we want to test is the operation of merging two arrays (test tool apache ab test)
bad.php
Things:
First add array 1 to the target array one by one;
After, traverse array 2 and compare whether the elements of array 2 appear in array 1. If not, insert them into the target array, otherwise ignore
<span style="font-size:14px;"><?php //准备两个内容随机的数组 $arr1 = $arr2 = $arr_merged = array(); //接下来随机给两个数组赋值 for ( $i=0; $i<rand(1000,2000); $i++) { $arr1[] = rand(); } for ( $i=0; $i<rand(1000,2000); $i++) { $arr2[] = rand(); } //开始循环比较 foreach ( $arr1 as $v ) { $arr_merged[] = $v; } foreach ( $arr2 as $v ) { if(!in_array($v, $arr_merged)){ $arr_merged[] = $v; } } var_dump($arr_merged);</span>
goods.php
Things:
Randomly generate two arrays and shuffle them in order
After that, use array_merge to merge
<span style="font-size:14px;"><?php //准备两个内容随机的数组 $arr1 = $arr2 = range(1000, 2000); $arr_merged = array(); //接下来随机给两个数组赋值 shuffle($arr1); shuffle($arr2); $arr_merged = array_merge($arr1, $arr2); var_dump($arr_merged); </span>
3 Use ab to test the speed of two php scripts: (ps: the amazing moment begins)
bad.php
goods.php喎?http://www.Bkjia.com/kf/ware/vc/" target="_blank" class="keylink">vcD4KPHA+PGltZyBzcmM9"http://www.2cto.com/uploadfile/Collfiles/20141205/20141205084010231.png" alt="">
For these two tests, we can clearly see that the difference is not a little bit different. When executing bad.php, I obviously felt the computer fan blowing. You know!
bad.php responds to 174 requests per second, processing 572ms per request
goods.php responds to 4050 requests per second, processing 24ms per request
ps: If you still use the bad wording, change it as soon as possible, and be careful not to let your boss know!
4 The reasonI am also surprised by this result, but the facts are right in front of me and there is nothing we can do about it. So why is there such an effect? Let’s continue to find out:
*.php (php code) -----Scanner (zend engine scans line by line into syntax that zend can recognize) ----> exprs
-----parser(parse to opcode)-----> opcodes ------exec(execute final output)-------> output
You can know that a PHP file needs to be scanned first to execute zend, and then parsed into opcode for execution output. The problem lies here. When we use PHP’s own functions, it actually belongs to the zend engine, so zend is relatively easy to parse. It's smooth and fast (goods.php), but when bad.php is executed, it will be slower, because reading code written by others is definitely not as fast as reading code written by yourself, right? So I still use the original one. It’s better not to make your own wheels!
To tell you a little more, this is why many Php extensions (such as apc) now cache opcodes because this eliminates the need for scanning and parsing, which is definitely faster!
5 Summary
Optimization points: write less code and use more capabilities provided by PHP itself
Performance issues:
The code I wrote is redundant, not readable, and has low performance
Why is the performance low?
The PHP code needs to be compiled and parsed into the underlying language. This process will be processed for each request, which is very expensive.
Good method:
Use more PHP built-in variables, constants, and functions (spl can bring you useful functions)

What’s still popular is the ease of use, flexibility and a strong ecosystem. 1) Ease of use and simple syntax make it the first choice for beginners. 2) Closely integrated with web development, excellent interaction with HTTP requests and database. 3) The huge ecosystem provides a wealth of tools and libraries. 4) Active community and open source nature adapts them to new needs and technology trends.

PHP and Python are both high-level programming languages that are widely used in web development, data processing and automation tasks. 1.PHP is often used to build dynamic websites and content management systems, while Python is often used to build web frameworks and data science. 2.PHP uses echo to output content, Python uses print. 3. Both support object-oriented programming, but the syntax and keywords are different. 4. PHP supports weak type conversion, while Python is more stringent. 5. PHP performance optimization includes using OPcache and asynchronous programming, while Python uses cProfile and asynchronous programming.

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.


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