Note: Notes for simple php performance optimization: Notes for php performance optimization. Note: Notes for simple php performance optimization: What are the conditions for php performance optimization? performance problems may occur: 1. incorrect php syntax 2. notes for users who are not good at using the php language: Notes for simple php performance optimization, notes for php performance optimization
What are the possible performance problems:
1. incorrect php syntax
2. I used php to do what I was not good.
3. the services connected in php language are not powerful.
4. php's own short board
5. I don't know either.
General Situation: php performance problems cannot exceed 1/2 (generally 30% ~ 40%)
Php performance problem solution:
Php language-level performance optimization-> php peripheral problems performance optimization (connection service, network environment)-> php language self-analysis and optimization
(Php language level)
Optimization: less code writing and more php capabilities
Problem: Self-writing code is redundant and not readable, resulting in low performance.
Why is it low: php code needs to be compiled and parsed to the underlying language. this process is processed every time a request is sent, with a high overhead.
Methods: use php built-in variables, constants, and functions.
Optimization: php built-in functions
Situation description: php built-in functions, there are still slow differences between them
Suggestion: Learn more about the time complexity of php built-in functions
Optimization: use as few magic functions as possible
Situation description: Magic functions provided by php have poor performance.
Why is the performance low: the php language has done a lot for you to save the trouble for php programmers
Good method: Avoid using php magic functions as much as possible
Optimization point: error blocker with additional overhead @
Actual logic: before the code starts, set the highest error level, and then reply to the set error level. Added Opcode to ignore error reporting
Optimization: reasonable memory usage
Situation description: php has a memory recovery mechanism, but please be careful when using the memory
Suggestion: use unset () to release unsuitable memory in a timely manner (note: unset () cannot be canceled)
Optimization: use regular expressions as few as possible
Situation description: the backtracking overhead of the expression is large. "no diamond is used to capture ceramics"
Suggestion: use string processing functions to implement the same logic
Optimization: avoid computation in a loop
Case description: the computation formula in the loop will be repeated.
<? Php $ str = "hello world"; a // strlen ($ str) put it outside for ($ I = 0; $ I
Optimization: reduce computing-intensive business
Case description: php is not suitable for intensive computing scenarios.
Why? Php language features make php not suitable for big data computing
Php: suitable for connecting Webserver to backend services and UI presentation
Optimization point: Be sure to use a string with quotation marks as the key value
Case description: php treats key values without quotation marks as constants, resulting in overhead for constant search.
Suggestion: use quotation marks strictly as the key value.
(Performance Optimization for php peripheral problems )-
Runtime Environment, file storage, database, cache, network
Reduce file operations
Common php overhead sequence:
Read/Write disk, read/write database, read/write memory, read/write network data
Read/write memory < <读写数据库<读写磁盘<读写网络数据
Optimize network requests
Network request pitfalls:
1. uncertainty of the peer interface
2. network stability
How to optimize network requests?
1. set the timeout time
A) connection timeout: 200 ms
B) read timeout 800 ms
C) write timeout 500 ms
2. parallelization of serial requests
A) use curl_multi _*()
B) use swoole extension
Compressing php interface output
Cache repeated computing content
Under what circumstances will the output content be cached?
Multiple requests, unchanged content
Overlapping time window ideas
Analysis of php analysis and optimization:
Test with tools
PHP performance bottleneck solution:
Opcode cache (the last step of code compilation for caching) PHP extension APC for Opcode caching
Supplemental stress testing software instructions:
Apache Benchmark (AB) is a stress testing software provided by Apache. this software is provided when the apache server is installed.
-N requests-c concurrency url target pressure test address
The above content introduces you to some simple considerations for php performance optimization. I hope this article will help you.
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Performance problems may occur in the future: 1. improper use of php syntax 2. use php language to do what it is not good...