Description:
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Hello,

utilizing one LAMP server for multiple webs and/or domains is quite common now. It would be great to limit the usernames which can be used to connect to MySQL database from PHP per Apache virtual and/or PHP-fpm.
For example - there is one shared MySQL server for all webs. In the configuration of each web can be list of acceptable usernames to access the database. For example as php_admin_value='user1' in apache virtual. In a case that this virtual invoke in PHP mysqli_connect with different username than 'user1', this will be prohibited.
This can improve the security of shared web server services, because one web cannot make brute force password attack to databases of other webs.

BR,

Zdenek