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What happens if you call wp_nav_menu() with a theme_location that is not registered?

medium📝 component behavior Q5 of 15
Wordpress - Themes and Appearance
What happens if you call wp_nav_menu() with a theme_location that is not registered?
AWordPress throws a fatal error and stops loading
BNo menu is displayed and a fallback menu may appear
CThe function outputs the last registered menu instead
DIt displays a default menu with all pages automatically
Step-by-Step Solution
Solution:

  1. Step 1: Understand wp_nav_menu fallback behavior

    If the theme_location is not registered or has no menu, WordPress shows no menu or a fallback.

  2. Step 2: Confirm no fatal error occurs

    WordPress does not crash; it handles missing menus gracefully.

  3. Final Answer:

    No menu is displayed and a fallback menu may appear -> Option B

  4. Quick Check:

    Missing menu location = no menu or fallback [OK]
Quick Trick: Unregistered theme_location shows no menu or fallback [OK]
Common Mistakes:
  • Expecting a fatal error
  • Assuming it shows last registered menu
  • Thinking it auto-displays all pages

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