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Finally I found the correct answer. declare is a system reserved keyword, so this database table cannot be used. . . After all, he is too young. . .

Your MySQL port seems to be 3305, but you did not specify it. The default port is 3306.

Do I need to specify the fields of the table?

First of all, it is not recommended to use MySQL extension, it is unsafe, and PHP has been abandoned. Use MySQLi or PDO.

Secondly. If the execution fails, use mysql_error()
to obtain the error information.