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

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@markjaquith markjaquith commented Dec 7, 2016

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