Version of `add_filter()` for WordPress that only runs once

suicidal-filter.php

<?php

/*
Use this just like `add_filter()`, and then run something that calls the filter (like
`new WP_Query`, maybe).

That's it. If the filter gets called again, your callback will not be.

This works around the common "filter sandwich" pattern where you have to remember to
call `remove_filter` again after your call.
*/

function add_suicidal_filter( $hook, $callback, $priority = 10, $params = 1 ) {
	add_filter( $hook, function( $first_arg ) use( $callback ) {
		static $ran = false;

		if ( $ran ) {
			return $first_arg;
		}

		$ran = true;
		return call_user_func_array( $callback, func_get_args() );
	}, $priority, $params );
}

See @Rarst's Advanced Hooks!