怎样使用PHP自动备份数据库
1、前言
mysql数据库的备份方式有很多；
例如：
1、使用mysqldump函数
mysqldump -u username -p dbname table1 table2 … > BackupName.sql
dbname参数表示数据库的名称
table1和table2参数表示需要备份的表的名称，为空则整个数据库备份；
BackupName.sql参数表设计备份文件的名称，文件名前面可以加上一个绝对路径。通常将数据库被分成一个后缀名为sql的文件；
基本使用：
2、管理工具
备份数据库的方法很多，上面两种比较常见
而本次主要讲解如何通过php函数来自动备份数据库
2、相关函数介绍
2.1 、fopen
详情参考：
2.2、array_keys
详情参考：
2.3、array_values
2.4、implode
详情参考：
2.5、 substr
详情参考：
2.6、fwrite
详情参考：
3、实现思路
4、代码构成
5、结语
备份数据库的主要过程：
1. 切换到对应的数据库；
2. 使用show create table tableName，获得表结构，写到文件中；
3. 然后查询所有的表数据，循环生成相对应 sql语句 ，写到文件中；
4. 试运行生成的sql文件；
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