Where I talk about me, programming and other stuff that you will not read

speed up and optimise php code

  • If a method can be static, declare it static. Speed improvement is by a factor of 4.
  • echo is faster than print.(* compare with list from phplens by John Lim)
  • 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.
See more from the source.


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