<b>决PHP存取MySQL 4.1乱码问题</b>[MySQL防范]

从MySQL 4.1开始引入的多语言支持确切很棒,并且一些特点已经超越了其他的数据库系统.不过我在测试历程中发现利用实用于MySQL 4.1之前的PHP语句操作MySQL数据库会造成乱码,即便是设置过了表字符集也是如此.

MySQL 4.1的字符集支持(Character Set Support)有两个方面:字符集(Character set)和排序方法(Collation).关于字符集的支持细化到四个层次: 服务器(server),数据库(database),数据表(table)和衔接(connection).

查看系统的字符集和排序方法的设定可以通过下面的两条号令:

mysql> SHOW VARIABLES LIKE 'character_set_%';

+--------------------------+----------------------------+

| Variable_name | Value |

+--------------------------+----------------------------+

| character_set_client | latin1 |

| character_set_connection | latin1 |

| character_set_database | latin1 |

| character_set_results | latin1 |

| character_set_server | latin1 |

| character_set_system | utf8 |

| character_sets_dir | /usr/share/mysql/charsets/ |

+--------------------------+----------------------------+

7 rows in set (0.00 sec)

mysql> SHOW VARIABLES LIKE 'collation_%';

+----------------------+-------------------+

| Variable_name | Value |

+----------------------+-------------------+

| collation_connection | latin1_swedish_ci |

| collation_database | latin1_swedish_ci |

| collation_server | latin1_swedish_ci |

+----------------------+-------------------+

3 rows in set (0.00 sec)

当我们按照本来的方法通过PHP存取MySQL数据库时,就算设置了表的默许字符集为utf8并且通过UTF-8编码发送查询,你会发现存入数据库的仍旧是乱码.问题就出在这个connection衔接层上.办理办法是在发送查询前履行一下下面这句:

SET NAMES 'utf8';

它相当于下面的三句指令:

SET character_set_client = utf8;

SET character_set_results = utf8;

SET character_set_connection = utf8;

再试试看,就正常了.