<?php
add_filter( 'example_filter', '__return_true' ); // returns true
add_filter( 'example_filter', '__return_false' ); // returns false
add_filter( 'example_filter', '__return_zero' ); // returns 0
add_filter( 'example_filter', '__return_null' ); // returns null
add_filter( 'example_filter', '__return_empty_string' ); // returns an empty string
add_filter( 'example_filter', '__return_empty_array' ); // returns an empty array()
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