现在开发主要用mysql对象，还是pdo，还是mysqli拓展库
说下各自优缺点。非常感谢！
------解决方案--------------------
mysql函数组是基于 mysql4 写成
mysqli函数组是基于 mysql5 写成，由于利用了 mysql5 的新特征，所以性能要强于mysql函数组
pdo 包容了常见数据库，更换数据库系统只需更换 dsn 串。便于系统的迁移
------解决方案--------------------
mysql 在用 mysqli 也在用 pdo 刚在用....
所以 如果你觉得你的数据库一直不会更换...那么首选可能应该是mysqli
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