1、If a method can be static, declare it static. Speed improvement is by a factor of 4。

1、如果一個函數可以聲明為靜態的，那么就用靜態的，速度是改進的一個因素4。

2、# Avoid magic like __get, __set, __autoload

2、避免使用__get, __set, __autoload等魔術函數

3、require_once() is expensive

3、require_once()是相當昂貴的。

4、Use full paths in includes and requires, less time spent on resolving the OS paths.

4、用include和require時，盡量用全路徑，可以減少花在解決OS路徑的時間

5、If you need to find out the time when the scrīpt started executing, $_SERVER[’REQUEST_TIME’] is preferred to time()

5、如果你需要知道一個腳本的開始運行時間，用 $_SERVER[’REQUEST_TIME’]比用time()要好

6、See if you can use strncasecmp, strpbrk and stripos instead of regex

6、如果可以用strncasecmp, strpbrk and stripos就別用正則

7、preg_replace is faster than str_replace, but strtr is faster than preg_replace by a factor of 4

7、preg_replace比str_replace要快，但是strtr比preg_replace更快

8、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.

一些函數，比如字符串替換函數，接受數組和單個字符做為參數，并且如果你的參數列表不是很長，考慮寫一些冗余替換語句，每次傳送一個字符，代替一行代碼接受數組做為查找和替換的參數。

9、Error suppression with @ is very slow.

9、禁止錯誤輸出符號@是非常慢的。

10、$row[’id’] is 7 times faster than $row[id]

10、、$row[’id’]比 $row[id]快7倍

11、Error messages are expensive

11、錯誤信息是非常昂貴的

12、Do not use functions inside of for loop, such as for ($x=0; $x < count($array); $x) The count() function gets called each time.

12、不要在循環內部使用函數，比如： for ($x=0; $x < count($array); $x)。count()函數在每次循環中都會被調用。

對于模板，你是否在用smarty?這可能是保證把最經常訪問的頁面緩存起來的最快的方法了。