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The purpose of PHP code optimization is to improve the execution efficiency of PHP programs. When writing PHP code, you can optimize from the following aspects:
1. Use single quotes instead of double quotes to contain strings
2. If you can define a class method as static, try to define it as static, and its speed will increase by nearly 4 times.
3. Use echo instead of print, which is more efficient
4. Log out unused variables in time, especially large arrays, to free up memory
5. Try to avoid using __get(), __set (), __autoload()
6. require_once() is expensive, use it as little as possible
7. Try to use functions instead of regular expressions to complete the same function
8. str_replace function Faster than preg_replace function
9. Using branch statements (ie switch cases) is better than using multiple if, else if statements
10. Using @ to mask error messages is very inefficient
11. When executing the increment or decrement of variable $i, ++$i will be faster than $i++
12. Try to use PHP’s built-in functions
13. Inside the loop body Do not declare variables, especially large variables
14. foreach is more efficient, try to use foreach instead of while and for loops
15. Use $i+=1 instead of $i= $i+1, more efficient
16. For global Global variables, unset() them immediately after use
17. Do some caching appropriately
The above introduces the methods of optimizing PHP code, including aspects of it. I hope it will be helpful to friends who are interested in PHP tutorials.