If a method can be static‚ declare it static. Speed improvement is by a factor of 4. echo is faster than print. Use echo’s multiple parameters instead of string concatenation. Set the maxvalue for your for-loops before and not in the loop. Unset your variables to free memory‚ especially large arrays. Avoid magic like __get‚ __set‚ __autoload require_once() is expensive Use full paths in includes and requires‚ less time spent on resolving the OS paths. If you need to find out the time when the script started executing‚ $_SERVER[’REQUEST_TIME’] is preferred to time() See if you can use strncasecmp‚ strpbrk and stripos instead of regex str_replace is faster than preg_replace‚ but strtr is faster than str_replace by a factor of 4 If the function‚ such as string replacement function‚ accepts both arrays and single characters as arguments‚ and if your argument list is not too long‚ consider writing a few redundant replacement statements‚ passing one character at a time‚ instead of one line of code that accepts arrays as search and replace arguments. It’s better to use select statements than multi if‚ else if‚ statements. Error suppression with @ is very slow. Turn on apache’s mod_deflate Close your database connections when you’re done with them $row[’id’] is 7 times faster than $row[id] Error messages are expensive Do not use functions inside of for loop‚ such as for ($x=0; $x < count($array); $x) The count() function gets called each time. Incrementing a local variable in a method is the fastest. Nearly the same as calling a local variable in a function. Incrementing a global variable is 2 times slow than a local var. Incrementing an object property (eg. $this->prop++) is 3 times slower than a local variable. Incrementing an undefined local variable is 9-10 times slower than a pre-initialized one. Just declaring a global variable without using it in a function also slows things down (by about the same amount as incrementing a local var). PHP probably does a check to see if the global exists. Method invocation appears to be independent of the number of methods defined in the class because I added 10 more methods to the test class (before and after the test method) with no change in performance.
Thanks for the tips. but it's widely used in most MVC frameworks. Can you please share your opinion about php (and any other template languages) MVC: pluses and minuses, thanks
Nice list! A couple comments: I used to be really anal about using mysql_close($the_conn_link), until I read this: I like everything neat and tidy when it comes to code; has anyone had any problems with large-traffic sites or resource intensive scripts while not implicitly closing mysql connections? I have always used include() instead of require_once(); Has anyone noticed any real differences or usage problems exchanging one for the other? Just curious.
Wow! Thanks for tips. I was looking for this cheat sheet for a while. I wish to see the same tips for MySQL quires. Let me know if somebody has it.