I was thinking of removing/hiding admin-bar from my wordpress (3.1.1) installation.

I visited following link:

http://codex.wordpress.org/Plugin_API/Filter_Reference/show_admin_bar

I was surprised to see only a single line to remove/hide admin-bar

add_filter( 'show_admin_bar', '__return_false' );

My question is what is __return_false means? why __ and _?

up vote 23 down vote accepted

WordPress contains built in functions for quickly returning values.

They are intended to be used as a quick built in function that returns a common value to a filter hook such as true, false, or an empty array.

  • __return_false — Returns the Boolean value of false.
  • __return_true — Returns the Boolean value of true.
  • __return_empty_array — Returns an empty PHP array.
  • __return_zero — Returns the integer 0.
  • __return_null — Returns NULL.
  • __return_empty_string — Returns ''.

Your Answer

By clicking "Post Your Answer", you acknowledge that you have read our updated terms of service, privacy policy and cookie policy, and that your continued use of the website is subject to these policies.

Not the answer you're looking for? Browse other questions tagged or ask your own question.