I am using the Wordpress get_users() function to search for users with a specific meta_key value.
$wordpress_user = get_users( array('meta_key' => 'unique_id', 'meta_value' => 'unique_id_value') );
According to the result of the preceding, I am performing the creation of a new wordpress user, or if the user already exists, I am simply logging in that user.
The 'meta_key' is about 10 character's length, with letters and number and i am retrieving it from an external source : for more secure behaviour, I would like to know if the get_users function will use case-sensitive research. (If not I have a potential risk in the future that I retrieve 2 similar meta_key, with an upper case / lower case difference...)
In addition I have noticed all wordpress table, including wp_users_meta do have "_ci" so that is an additional reason why I do not feel secure with my present code.
Thank you in advance if you can provide me some information about that !