Shulou(Shulou.com)06/03 Report--

This article mainly introduces the php performance optimization points for attention, the article is very detailed, has a certain reference value, interested friends must read!

Under what circumstances, you may encounter performance problems:

Inappropriate use of 1.php syntax

two。 Using php language to do what it's not good at.

3. The service connected in php language is not powerful.

The deficiency of 4.php itself

5. A problem I don't know.

General situation: php performance problems are no more than 1/2 (generally 30% to 40%)

Direction of php performance problem resolution:

Performance optimization at the php language level-> performance optimization for php peripheral issues (connected services, network environment)-> php language self-analysis and optimization

(php language level)

Optimization: write less code and use more of php's own capabilities

Problem: self-written code has more redundancy and poor readability, resulting in low performance

Why low: php code needs to be compiled and parsed into the underlying language, which is processed every time a request is made, which is expensive.

Method: use php built-in variables, constants and functions more often

Optimization point: the performance of php built-in functions

Situation description: php built-in functions, there is still a difference between the speed

Suggestion: learn more about the time complexity of php built-in functions

Optimization point: use as few magic functions as possible

Description: the magic function provided by php has poor performance

Why low performance: the php language has done a lot for you to save trouble for php programmers

Good way: avoid using php magic functions as much as possible

Optimization point: error suppressors that generate extra overhead @

Actual logic: set the highest error level before the start of the code, and then reply to set the error level after the end. Add Opcode and ignore error report

Optimization point: rational use of memory

Description: php has a memory recovery mechanism to protect the bottom, but please use memory carefully.

Suggestion: use unset () to release unsuitable memory in time (Note: unset () cannot be logged out)

Optimization points: use regular expressions as little as possible

Description: the backtracking cost of the expression is high, "don't do ceramic work without diamond".

Suggestion: use string processing function to realize the same logic

Optimization points: avoid doing operations in a loop

Situation description: the formula within the loop will be repeated.

Optimization point: reduce computing-intensive business

Situation description: php is not suitable for intensive computing scenarios

Why? The characteristics of php language determine that php is not suitable for large data operations.

Php is suitable for scenarios: suitable for connecting Webserver with back-end services and UI rendering.

Optimization points: be sure to use quoted strings as key values

Description: php will treat key values without quotation marks as constants, resulting in the overhead of finding constants

Suggestion: strictly use quotation marks as key values

-

(performance optimization of php peripheral issues)-

Running environment, file storage, database, cache, network

Reduce file class operations

The cost order of common php scenarios:

Read-write disk, read-write database, read-write memory, read-write network data

Read and write memory

Welcome to subscribe "Shulou Technology Information " to get latest news, interesting things and hot topics in the IT industry, and controls the hottest and latest Internet news, technology news and IT industry trends.