Description:
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It is possible to set character set for PHP script before mysqli_connect, but http://php.net/manual/en/mysqli.options.php does not say anything about it. It lists, instead, MYSQLI_READ_DEFAULT_FILE and MYSQLI_READ_DEFAULT_GROUP which have no effect if mysqlnd used.

Originally reported at http://bugs.mysql.com/bug.php?id=75466

Test script:
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$ php -m | grep mysql
mysql
mysqli
mysqlnd
pdo_mysql

$ php -r '$m=mysqli_init(); $m->options(MYSQLI_READ_DEFAULT_FILE, "/Users/sveta/.my.cnf"); $m->options(MYSQLI_READ_DEFAULT_GROUP, "client"); $m->connect("127.0.0.1","root","f"); '

Warning: mysqli::connect(): (HY000/1045): \0414\043E\0441\0442\0443\043F \0437\0430\043A\0440\044B\0442 \0434\043B\044F \043F\043E\043B\044C\0437\043E\0432\0430\0442\0435\043B\044F 'root'@'localhost' (\0431\044B\043B \0438\0441\043F\043E\043B\044C\0437\043E\0432\0430\043D \043F\0430\0440\043E\043B\044C: \0414\0410) in Command line code on line 1


$ php -r '$m=mysqli_init(); $m->options(MYSQLI_SET_CHARSET_NAME, "utf8"); $m->connect("127.0.0.1","root","f");'

Warning: mysqli::connect(): (HY000/1045): Доступ закрыт для пользователя 'root'@'localhost' (был использован пароль: ДА) in Command line code on line 1
Svetas-MacBook-Pro:mysql-git sveta$ php -r '$m=mysqli_init(); $m->connect("127.0.0.1","root","f");'



Expected result:
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I expect either full list of options which can be specified for mysqli::options or link to MySQL documentation with full list. But in latter case all options which are not supported by PHP extension should be noted at http://php.net/manual/en/mysqli.options.php

Actual result:
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See "test script" part.