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Retrieve user data based on field.
Use get_profile() will make a database query to get the value of the table column. The value might be cached using the query cache, but care should be taken when using the function to not make a lot of queries for retrieving user profile information.
If the $user parameter is not used, then the user will be retrieved from a cookie of the user. Therefore, if the cookie does not exist, then no value might be returned. Sanity checking must be done to ensure that when using get_profile() that (empty|null|false) values are handled and that something is at least displayed.
<?php get_profile( $field, $user ); ?>
get_profile() is located in wp-includes/user.php - (2.9.2)
get_profile() is located in wp-includes/deprecated.php - (Deprecated, 3.0)