simple question: what is this small code searching for?

  • what is this code searching for?
    would $user be a number, like user # 4?
    or would it be the user name, like “haloplayerman”?

    $user = wp_get_current_user();

$query = mysql_query('SELECT * FROM bookmarks WHERE user_id = "' . mysql_real_escape_string ( $_SESSION['$user'] ) . '"' ) or die ( mysql_error () );
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