I am getting this error which

Fatal error: Uncaught Error: Call to undefined function wp_nav_menu() in /home/stageidg/public_html/idg/wp-content/themes/idg-child/secondmenu.php:2 Stack trace: #0 {main} thrown in /home/stageidg/public_html/idg/wp-content/themes/idg-child/secondmenu.php on line 2

line 2 in the php file is this:

wp_nav_menu( array('menu' => 'Services', 'theme_location'=>'services' ) );

and its being called by this jquery code:

url: "http://example.com/idg/wp-content/themes/idg-child/secondmenu.php", // path to your PHP file
success: function(data)

   $(data).appendTo(inner_overlay); // load-into-div is the ID of the DIV where you load the <select>

} // success
}); // ajax

any idea? what am i doing wrong?

  • 2
    secondmenu.php is called separately, not in a WordPress context, so it doesn't know anything about the WordPress functions.
    – fuxia
    Jun 11, 2019 at 20:11

1 Answer 1


Yes, like @fuxia says, include wp-load.php to get the WordPress API (wp_nav_menu included) to use. In your case:


include '../../../../wp-load.php';

This way you did is not wrong but there are better ways to use AJAX in WordPress:


Be happy, my friend!

  • this worked! well i had to do another way but it did lead me to the answer which was... define( 'WP_USE_THEMES', false ); // Don't load theme support functionality require( '../../../wp-load.php' ); thank you for the prompt response!
    – jgax87
    Jun 11, 2019 at 21:47

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