1、If a method can be static, declare it static. Speed improvement is by a factor of 4.
1、如果一个函数可以声明为静态的，那么就用静态的，速度是改进的一个因素4.
2、# Avoid magic like __get, __set, __autoload
2、避免使用__get, __set, __autoload等魔术函数
3、require_once() is expensive
3、require_once()是相当昂贵的。
4、Use full paths in includes and requires, less time spent on resolving the OS paths.
4、用include和require时，尽量用全路径，可以减少花在解决OS路径的时间
5、If you need to find out the time when the scrīpt started executing, $_SERVER[’REQUEST_TIME’] is preferred to time()
5、如果你需要知道一个脚本的开始运行时间，用 $_SERVER[’REQUEST_TIME’]比用time()要好
6、See if you can use strncasecmp, strpbrk and stripos instead of regex
6、如果可以用strncasecmp, strpbrk and stripos就别用正则
7、preg_replace is faster than str_replace, but strtr is faster than preg_replace by a factor of 4
7、preg_replace比str_replace要快，但是strtr比preg_replace更快
8、If the function, such as string replacement function, accepts both arrays and single characters as arguments, and if your argument list is not too long, consider writing a few redundant replacement statements, passing one character at a time, instead of one line of code that accepts arrays as search and replace arguments.
一些函数，比如字符串替换函数，接受数组和单个字符做为参数，并且如果你的参数列表不是很长，考虑写一些冗余替换语句，每次传送一个字符，代替一行代码接受数组做为查找和替换的参数。
9、Error suppression with @ is very slow.
9、禁止错误输出符号@是非常慢的。
10、$row[’id’] is 7 times faster than $row[id]
10、、$row[’id’]比 $row[id]快7倍
11、Error messages are expensive
11、错误信息是非常昂贵的
12、Do not use functions inside of for loop, such as for ($x=0; $x < count($array); $x) The count() function gets called each time.
12、不要在循环内部使用函数，比如： for ($x=0; $x < count($array); $x)。count()函数在每次循环中都会被调用。
对于模板，你是否在用smarty?这可能是保证把最经常访问的页面缓存起来的最快的方法了。