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<?php
function has_nav_menu( $location ) {
    $locations = get_nav_menu_locations();
    return ( ! empty( $locations[ $location ] ) );
}
?>

• Function Reference/has nav menu « WordPress Codex
  Description. Returns boolean Whether a registered nav menu location has a menu assigned(true) or not(false). Usage. <?php if ( has_nav_menu( $location ) ) { ...
  codex.wordpress.org
• Wordpress child theme, adding secondary menu - Stack Overflow
  <?php if ( function_exists('has_nav_menu') && has_nav_menu('primary-menu') ) { wp_nav_menu( array( 'sort_column' => 'menu_order', ...
  stackoverflow.com
• Goodbye, headaches. Hello, menus!
  Jun 1, 2010 ... Update: Props to Andrew Nacin for adding the has_nav_menu() ... WordPress has a conditional tag called has_nav_menu() to check if a menu ...
  justintadlock.com
• has_nav_menu | A HitchHackers guide through WordPress
  Feb 12, 2011 ... Source code. function has_nav_menu( $location ) { $locations = get_nav_menu_locations(); return ( ! empty( $locations[ $location ] ) ); }. 1935 ...
  hitchhackerguide.com

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