12 PHP optimization tips
- If a method can be static, declare it static. Speed improvement is by a factor of 4.
- 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[â€™REQUEST_TIMEâ€™] is preferred to time()
- See if you can use strncasecmp, strpbrk and stripos instead of regex
- preg_replace is faster than str_replace, but strtr is faster than preg_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.
- Error suppression with @ is very slow.
- $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.
As blogged by alexmoskalyuk