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This Conditional Tag checks if the given id, slug, or name is a navigation menu. This is a boolean function, meaning it returns either TRUE or FALSE.
<code style="color: #000000"><span style="color: #0000BB"><?php is_nav_menu</span><span style="color: #007700">( </span><span style="color: #0000BB">$id </span><span style="color: #007700">); </span><span style="color: #0000BB">?></span></code>
Since: 3.0.0
is_nav_menu() is located in wp-includes/nav-menu.php.