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 offalse.__return_true— Returns the Boolean value oftrue.__return_empty_array— Returns an empty PHParray.__return_zero— Returns the integer0.__return_null— ReturnsNULL.__return_empty_string— Returns''.
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