Years may wrinkle the skin, but to give up enthusiasm wrinkles the soul.
歲月留痕，只及肌膚；激情不再，皺起心靈。———— Samuel Ullman
據(jù)說是一個百度php的面試題，已給定一個數(shù)組：$arr = array(‘b’=>’a’, ‘c’=>’a’, ‘e’=>’b’, ‘d’=>’b’, ‘f’=>’c’, ‘g’=>’e’, ‘h’=>’f’);寫一個算法，完成到以下格式的轉(zhuǎn)換：array ( 'a' => array ( 'b' => ar...