wp-includes/ms-deprecated.php:546Check whether a usermeta key has to do with the current blog.
$keystring$user_idintoptional0$blog_idintoptional0boolfunction is_user_option_local( $key, $user_id = 0, $blog_id = 0 ) { global $wpdb; _deprecated_function( __FUNCTION__, '4.9.0' ); $current_user = wp_get_current_user(); if ( $blog_id == 0 ) { $blog_id = get_current_blog_id(); } $local_key = $wpdb->get_blog_prefix( $blog_id ) . $key; return isset( $current_user->$local_key );}Introduced in MU (3.0.0). Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
src/wp-includes/ms-deprecated.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.