mysql_change_user() Function in PHP

What is mysql_change_user function in PHP?
How does mysql_change_user() works?


This mysql_change_user() function in php Change logged in user of the active connection.
int mysql_change_user(string user, string password[,
string database[, resource link_identifier]])

mysql_change_user() changes the logged in user of the current active connection, or the connection given in the optional link_identifier parameter. If a database is specified, this will be the current database after the user has been changed. If the new user and password authentication fails, the current connected user stays active.
If the link identifier is not specified, the last link opened by mysql_connect() function is assumed. If no such link is found, it will try to create one as if mysql_connect() was called with no arguments. If by chance no connection is found or established, an E_WARNING level warning is generated.
This function is deprecated and no longer exists in PHP.

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