我正在从php mysql_ *方法将网站迁移到php mysqli中。

我有以下代码可以完成这项工作：

mysql_query("SET NAMES 'utf8' COLLATE 'utf8_unicode_ci'");

没有此查询，我的字符串字符(使用格鲁吉亚语)带有问号。
例如，它写成????????? 代替 ？？？？？？？？？

因此，由于它能完成工作，所以我很高兴，但是现在我无法对mysqli进行同样的操作。

有人可以帮我吗？ 谢谢。

不建议使用mysqli查询来设置名称，而是使用mysqli :: set_charset

请参阅https://bugs.php.net/bug.php?id=52267，该文档从[email protected]获得了响应：

...use mysqli_set_charset() to set the charset and then SET NAMES to change the collation.

他/她还链接到http://dev.mysql.com/doc/refman/5.1/en/mysql-set-character-set.html

This function is used to set the default character set for the current connection. The string csname specifies a valid character set name. The connection collation becomes the default collation of the character set. This function works like the SET NAMES statement, but also sets the value of mysql->charset, and thus affects the character set used by mysql_real_escape_string()

并且我将链接到http://dev.mysql.com/doc/refman/5.6/en/charset-collate.html，其中显示了如何使用适合该查询的排序规则进行查询。

With the COLLATE clause, you can override whatever the default collation is for a comparison. COLLATE may be used in various parts of SQL statements. Here are some examples:

• With ORDER BY:
  SELECT k
  FROM t1
  ORDER BY k COLLATE latin1_german2_ci;

• With AS:
  SELECT k COLLATE latin1_german2_ci AS k1
  FROM t1
  ORDER BY k1;

• With GROUP BY:
  SELECT k
  FROM t1
  GROUP BY k COLLATE latin1_german2_ci;

• With aggregate functions:
  SELECT MAX(k COLLATE latin1_german2_ci)
  FROM t1;

• With DISTINCT:
  SELECT DISTINCT k COLLATE latin1_german2_ci
  FROM t1;

• With WHERE:
  SELECT *
  FROM t1
  WHERE _latin1 'Müller' COLLATE latin1_german2_ci = k;
  SELECT *
  FROM t1
  WHERE k LIKE _latin1 'Müller' COLLATE latin1_german2_ci;

• With HAVING:
  SELECT k
  FROM t1
  GROUP BY k
  HAVING k = _latin1 'Müller' COLLATE latin1_german2_ci;

http://php.net/manual/en/mysqli.set-charset.php

要么

mysqli->set_charset("utf8")

您可以使用mysqli_set_charset

This is the preferred way to change the charset. Using mysqli_query()
to set it (such as SET NAMES utf8) is not recommended.

但是，要设置排序规则，您仍然必须使用SET NAMES查询。