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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 _?
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 ''.
function justToReturnFalse() { return false; }
\add_filter( 'woocommerce_email_enabled_new_order, '__return_false' );