WordPress __return_{x} handlers for filters

<?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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