Summarize the 20 efficiency points of PHP programming

1. If you can define the class method as static, try to define it as static, and its speed will be increased by nearly 4 times. .

2, row['id']'s speeddegree It is 7 times that of <span style="font-size: 14px; line-height: 1.76em;">row[id]</span>.

3, echo is faster than print , and uses multiple parameters of echo (Annotation: refers to using commas instead of periods) instead of string concatenation, such as echo str1,str2.

4. Determine the maximum number of loops before executing the for loop. Do not calculate the maximum value every loop. It is best to use foreach instead.

5. Unregister unused variables, especially large arrays, to free up memory.

6. Try to avoid using __get, __set, __autoload.

7, require_once() is expensive.

8. Try to use absolute paths when include files, because it avoids the speed of PHP searching for files in include_path, and the time required to parse the operating system path will be less.

9. If you want to know the time when the script starts executing (annotation: the server receives the client request), use $_SERVER['REQUEST_TIME'] is better than time ().

10. Functions replace regular expressions to complete the same function.

11, str_replace function is faster than preg_replace function, but strtr function is four times more efficient than str_replace function .

12. If a string replacement function accepts arrays or characters as parameters, and the parameter length is not too long, you can consider writing an additional replacement code so that each parameter passed is a character instead of Just write one line of code to accept arrays as parameters for query and replace.

13. It is better to use a select branch statement (Translation annotation: switch case) than to use multiple if, else if statements.

14. Using @ to block error messages is very inefficient, extremely inefficient.

15. Open the mod_deflate module of apache to improve the browsing speed of web pages.

16. The database connection should be closed when finished using it. Do not use long connections.

17. Error messages are expensive.

18. Increasing local variables in the method is the fastest. Almost as fast as calling local variables in a function.

19. Incrementing a global variable is 2 times slower than incrementing a local variable.

20. Incrementing an object property (such as: $this->prop ) is 3 times slower than incrementing a local variable.

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