请问用php将数据以以下形式保存到文档中，后期调用时数据重新组装

a:3:{i:1;a:7:{s:7:"friends";s:1:"0";s:3:"uid";s:1:"1";s:8:"username";s:6:"sutuan";s:16:"videophotostatus";s:1:"0";s:7:"groupid";s:1:"1";s:7:"credits";s:2:"41";s:9:"spacenote";s:30:"今天，下雨开心。。。";}i:2;a:7:{s:7:"friends";s:1:"0";s:3:"uid";s:1:"2";s:8:"username";s:4:"akoo";s:16:"videophotostatus";s:1:"0";s:7:"groupid";s:2:"10";s:7:"credits";s:1:"6";s:9:"spacenote";s:0:"";}i:3;a:7:{s:7:"friends";s:1:"0";s:3:"uid";s:1:"3";s:8:"username";s:12:"购物达人";s:16:"videophotostatus";s:1:"0";s:7:"groupid";s:2:"10";s:7:"credits";s:2:"21";s:9:"spacenote";s:42:"泡吧活动，我喜欢！你呢？哈哈";}}


最好有视频：急、急、急！先谢谢先！

已经在php手册找到解决办法序列化和返序列化就ok了