PHP优化总结
1、如果能将类的方法定义成static，就尽量定义成static，它的速度会提升将近4倍。
2、include文件时尽量使用绝对路径，因为它避免了PHP去include_path里查找文件的速度。
3、preg_replace 比str_replace速度快，strtr的执行速度将近是preg_replace的4倍。
4、$row[’id’] 的速度是$row[id]的7倍。
5、用foreach代替for ($x=0; $x 6、使用echo的多重参数（指用逗号而不是句点）代替字符串连接。比如echo $str1,$str2
7、使用选择分支语句（译注：即switch case）好于使用多个if，else if语句。
8、用单引号代替双引号来包含字符串，这样做会更快一些。因为PHP会在双引号包围的字符串中搜寻变量，单引号则不会。
9、不要为了OO而OO，能用数组代替对象最好。
10、方法调用看来与类中定义的方法的数量无关，因为我（在测试方法之前和之后都）添加了10个方法，但性能上没有变化。所以类文件的大小不会影响性能，当你需要时，你总能把代码分解成方法。
最好让这些总结成为你编码时候的习惯。
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