php内核学习网址

http://www.php-internals.com/

 

http://www.phppan.com/category/php-extention-source-code/page/5/

 

 

http://www.lpfin.com/post/2012-11-06/40042933662      

PHP的stdClass类详解及几种数组对象转换方法

http://blog.csdn.net/caleng/article/details/5276403#comments

 

http://blog.chedushi.com/archives/4044

php计算经纬度的距离