mysqli::$client_version -- mysqli_get_client_version — Returns the MySQL client version as a string
Returns client version number as an integer.
A number that represents the MySQL client library version in format: main_version*10000 + minor_version *100 + sub_version. For example, 4.1.0 is returned as 40100.
This is useful to quickly determine the version of the client library to know if some capability exists.
Example #1 mysqli_get_client_version
/* We don't need a connection to determine
the version of mysql client library */
printf("Client library version: %d\n", mysqli_get_client_version());