1、Full-Text RestrictionsFull-text searches are supported for MyISAM tables only. In MySQL 5.0, full-text searches can be used with most multi-byte character sets. The exception is that for Unicode; the utf8 character set can be used, but not the ucs2 character set. Ideographic languages such as Chinese and Japanese do not have word delimiters. Therefore, the FULLTEXT parser cannot determine where words begin and end in these and other such languages. The implications of this and some workarounds for the problem are described in Section 12.7, “Full-Text Search Functions”. While the use of multiple character sets within a single table is supported, all columns in a FULLTEXT index must use the same character set and collation. The MATCH() column list must match exactly the column list in some FULLTEXT index definition for the table, unless this MATCH() is IN BOOLEAN MODE. The argument to AGAINST() must be a constant string. 2、php配置文件中，去掉这行前面的分号，重新启动web server;extension=php_mbstring.dll
Mysql只有MyISAM表类型才支持fulltext,你查一查你的表类型.
2、php配置文件中，去掉这行前面的分号，重新启动web server;extension=php_mbstring.dll