PHP & Mysql Code optimization

Jul 29, 20170 likes127 views

This document discusses various techniques for optimizing PHP code performance and efficiency. It covers optimizing code execution speed, memory usage, database queries, and caching. Specific tips include using single quotes for strings, removing unused code, type hinting functions, using generators for memory, and caching objects, routes, and configurations. Database optimizations include indexing columns, normalizing data, and using EXPLAIN to analyze queries. General tips promote avoiding unnecessary processing, leveraging IDE features, and measuring performance.

Some useful tricks &
techniques for code
optimization
By Abu Saleh Muhammad Shaon
PHP developer at VroomVroomVroom

Today's goals
➢ How to run code faster
➢ How to optimize memory usages
➢ How to optimize query
➢ How to optimize use of caching
➢ Some tools that can help for better coding

Things to be consider while coding
➢ Always use single quote for string

Things to be consider while coding
➢ Always remove unused namespace

Things to be consider while coding
➢ Always remove unused codes, test codes, variables etc

Things to be consider while coding
➢ Don’t declare variables inside conditions which is used
out of the condition

Things to be consider while coding
➢ Use type hint for function parameters and return.
○ It will save parsing time
○ It will save you from unexpected in initial stage
○ One of the key performance point for PHP 7

Things to be consider while coding
➢ Use generator/yield for memory optimization

Things to be consider while coding
➢ For reading large file read line by line instead of read
whole file at once.
➢ For large array use chunk_array
➢ Unset large arrays when no longer needed
➢ Use reference if you want to modify array inside loop

Things to be consider while coding
➢ Use build in construct / functions as much as possible
○ PHP_EOL
○ array_*()
○ string_*()
○ FILTER_VALIDATE_*

Things to be consider while coding
➢ , is faster than .

Things to be consider while coding
➢ Avoid too much class abstraction/layer
➢ Don’t use else unless it needed
➢ Don’t run sql query inside loops
○ Special case if needed you can do batch operation

Things to be consider while coding
➢ Pre increment ++$i is faster than $++
➢ Avoid @ error suppress operator
➢ “foreach” is better than any other loops for Array
➢ “switch” is faster than if() else() condition

Things to be consider while coding
➢ “isset” is faster than “strlen”

Things to be consider while coding
➢ Use strict operator “===” “!==” while compare
something
➢ Normal replace/search function is faster than regular
expression based replace/search
○ Use ctype_alnum(), ctype_alpha() and ctype_digit() over regex

Things to be consider while coding
➢ Order of conditions can be fact

Caching
➢ Route cache
➢ Config cache
➢ Caching object/array
➢ Partial caching
➢ Use proper lifetime for caching

General optimization : Database
➢ Index columns those are using more frequent select
query
➢ Use columns lenght short as much as possible
○ INT instead of BIGINT
○ VARCHAR(10) instead of VARCHAR(255)

General optimization : Database
➢ Normalize redundant data from data
○ Can be possible by using separate table
➢ Remove create_at , deleted_at at from child table

General optimization : Database
➢ Pay special attention to columns those are using in join
➢ Define column as NOT NULL if possible
➢ An index on the whole column is not always necessary
○ Instead index just a prefix of a column
○ Prefix indexes take less space and the operation are
faster

General optimization : Database
➢ Query optimization tool Explain
➢ Explain tell you
○ In which order tables are reading
○ What types of query execute
○ Which indexes are using
○ How manys row are using to find the results

General optimization : Database
➢ Eager Loading the relational table
➢ It will solve n+1 problem

Demo - time : 5-7 mins
➢ DB Explain & Eager loading

General Tips
➢ Don’t make needless copies codes
➢ Use support of IDE’s as much as possible
➢ Don’t write code straight way without thinking very
common exceptional scenario.
➢ If possible use paper/pencil for find the solution, it will
give you more precise solutions.

Measuring Tools
➢ microtime()
➢ memory_get_usage()
➢ memory_get_peak_usage()
➢ Debugbar
➢ XDebug profiler

Some useful references
➢ https://www.sitepoint.com/php
➢ http://www.planet-php.net
➢ http://www.phpbuilder.com
➢ https://medium.com
➢ https://laravel-news.com
➢ https://www.digitalocean.com/community/tutorials
➢ https://en.wikipedia.org/wiki/PHP_Standard_Recommendation

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PHP & Mysql Code optimization

1. Some useful tricks & techniques for code optimization By Abu Saleh Muhammad Shaon PHP developer at VroomVroomVroom

2. Today's goals ➢ How to run code faster ➢ How to optimize memory usages ➢ How to optimize query ➢ How to optimize use of caching ➢ Some tools that can help for better coding

3. Things to be consider while coding ➢ Always use single quote for string

4. Things to be consider while coding ➢ Always remove unused namespace

5. Things to be consider while coding ➢ Always remove unused codes, test codes, variables etc

6. Things to be consider while coding ➢ Don’t declare variables inside conditions which is used out of the condition

7. Things to be consider while coding ➢ Use type hint for function parameters and return. ○ It will save parsing time ○ It will save you from unexpected in initial stage ○ One of the key performance point for PHP 7

8. Things to be consider while coding ➢ Use generator/yield for memory optimization

9. Things to be consider while coding ➢ For reading large file read line by line instead of read whole file at once. ➢ For large array use chunk_array ➢ Unset large arrays when no longer needed ➢ Use reference if you want to modify array inside loop

10. Things to be consider while coding ➢ Use build in construct / functions as much as possible ○ PHP_EOL ○ array_*() ○ string_*() ○ FILTER_VALIDATE_*

11. Things to be consider while coding ➢ , is faster than .

12. Things to be consider while coding ➢ Avoid too much class abstraction/layer ➢ Don’t use else unless it needed ➢ Don’t run sql query inside loops ○ Special case if needed you can do batch operation

13. Things to be consider while coding ➢ Pre increment ++$i is faster than $++ ➢ Avoid @ error suppress operator ➢ “foreach” is better than any other loops for Array ➢ “switch” is faster than if() else() condition

14. Things to be consider while coding ➢ “isset” is faster than “strlen”

15. Things to be consider while coding ➢ Use strict operator “===” “!==” while compare something ➢ Normal replace/search function is faster than regular expression based replace/search ○ Use ctype_alnum(), ctype_alpha() and ctype_digit() over regex

16. Things to be consider while coding ➢ Order of conditions can be fact

17. Things to be consider while coding

18. Caching ➢ Route cache ➢ Config cache ➢ Caching object/array ➢ Partial caching ➢ Use proper lifetime for caching

19. General optimization : Database ➢ Index columns those are using more frequent select query ➢ Use columns lenght short as much as possible ○ INT instead of BIGINT ○ VARCHAR(10) instead of VARCHAR(255)

20. General optimization : Database ➢ Normalize redundant data from data ○ Can be possible by using separate table ➢ Remove create_at , deleted_at at from child table

21. General optimization : Database ➢ Pay special attention to columns those are using in join ➢ Define column as NOT NULL if possible ➢ An index on the whole column is not always necessary ○ Instead index just a prefix of a column ○ Prefix indexes take less space and the operation are faster

22. General optimization : Database ➢ Query optimization tool Explain ➢ Explain tell you ○ In which order tables are reading ○ What types of query execute ○ Which indexes are using ○ How manys row are using to find the results

23. General optimization : Database

24. General optimization : Database ➢ Eager Loading the relational table ➢ It will solve n+1 problem

25. Demo - time : 5-7 mins ➢ DB Explain & Eager loading

26. General Tips ➢ Don’t make needless copies codes ➢ Use support of IDE’s as much as possible ➢ Don’t write code straight way without thinking very common exceptional scenario. ➢ If possible use paper/pencil for find the solution, it will give you more precise solutions.

27. Measuring Tools ➢ microtime() ➢ memory_get_usage() ➢ memory_get_peak_usage() ➢ Debugbar ➢ XDebug profiler

28. Some useful references ➢ https://www.sitepoint.com/php ➢ http://www.planet-php.net ➢ http://www.phpbuilder.com ➢ https://medium.com ➢ https://laravel-news.com ➢ https://www.digitalocean.com/community/tutorials ➢ https://en.wikipedia.org/wiki/PHP_Standard_Recommendation

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