php 優化

http://reinholdweber.com/?p=3 7 important for me: 1. If a method can be static, declare it static. Speed improvement is by a factor of 4. 2. Use echo’s multiple parameters instead of string concatenation. 3. Set the maxvalue for your for-loops before and not in the loop. 4. require_once() is expensive. 5. strtr is faster than str_replace by a factor of 4. 6. If you have very time consuming functions in your code, consider writing them as C extensions. 7. 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.