38. You can always split the code of a method later, when needed. 当你需要时，你总能把代码分解成方法。

39. Make use of the countless predefined functions. 尽量采用大量的PHP内置函数。

40. If you have very time consuming functions in your code, consider writing them as C extensions. 如果在代码中存在大量耗时的函数，你可以考虑用C扩展的方式实现它们。

41. Profile your code. A profiler shows you, which parts of your code consumes how many time. The Xdebug debugger already contains a profiler. Profiling shows you the bottlenecks in overview. 评估检验(profile)你的代码。检验器会告诉你，代码的哪些部分消耗了多少时间。Xdebug调试器包含了检验程序，评估检验总体上可以显示出代码的瓶颈。

42. mod_gzip which is available as an Apache module compresses your data on the fly and can reduce the data to transfer up to 80%. mod_zip可作为Apache模块，用来即时压缩你的数据，并可让数据传输量降低80%。

43. Excellent Article （http://phplens.com/lens/php-book/optimizing-debugging-php.php）about optimizing php by John Lim 另一篇优化PHP的精彩文章。