<?php $w = ‘w‘; $wb = ‘123‘.$w; $w = ‘ww‘; echo $wb; if(TRUE){ $wd = ‘123wd‘; } echo $wd; if(FALSE){ $we = ‘123wd‘; } var_dump($we);
php javascript C 变量环境 块级作用域
原文：http://www.cnblogs.com/yuanjiangw/p/5977571.html
