摘要：
1. If a method can be static, declare it static. Speed improvement is by a factor of 4. 如果一个方法可静态化，就对它做静态声明。速率可提升至4倍。2. echo is faster than print. echo 比 print 快。3. Use echo’s multiple parameters instead of string concatenation. 使用echo的多重参数（译注：指用逗号而不是句点）代替字符串连接。4. Set the maxvalue for your for-loops 阅读全文