WorddPress Self unhooking nested anonymous function

gistfile1.php

//Ensure that we don't allow creation of tickers via insertion of a post with non-existent tickers assigned
//Tickers should only be created via the admin ticker interface or via automatic pull-in from xignite
add_filter( 'wp_insert_post_data', function( $data, $post_arr ) {

	if ( empty( $post_arr['tax_input']['ticker'] ) ) {
		return $data;
	}

	$created_tickers = array();

	//Can be a comma separated string, ensure we are working with an array
	if ( ! is_array( $post_arr['tax_input']['ticker'] ) ) {
		$post_arr['tax_input']['ticker'] = explode( ',', str_replace( ' ', '', $post_arr['tax_input']['ticker'] ) );
	}

	//Find all tickers assigned which do not exist
	foreach ( $post_arr['tax_input']['ticker'] as $ticker ) {

		if ( ! is_numeric( $ticker ) && ! wpcom_vip_get_term_by( 'name', $ticker, 'ticker' ) ) {
			$created_tickers[] = $ticker;
		}
	}

	if ( $created_tickers ) {

		//After the post is inserted, delete all created tickers
		$f = function() use ( $created_tickers, &$f ) {

			foreach ( $created_tickers as $ticker ) {

				$term = get_term_by( 'name', $ticker, 'ticker' );

				//Only delete the ticker if it exists and does not have other posts assigned (failsafe)
				if ( $term && $term->count < 2 ) {
					wp_delete_term( $term->term_id, 'ticker' );
				}
			}

			remove_action( 'wp_insert_post', $f, 1 );
		};

		add_action( 'wp_insert_post', $f, 1 );
	}

	return $data;

}, 100, 2 );

You should follow @joehoyle on twitter :-)

add_filter( 'foo', $c = function() use ( &$c ) { remove_filter( 'foo', $c ) } ); Nice trick to only run a hook once in #WordPress

— Joe Hoyle (@joe_hoyle) May 3, 2012

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