gistfile1.txt

function wpcm_my_listings_vehicle_thumbnail_size( $thumb_size ) {
	return 'wpcm-my-thumbnail';
}

add_filter( 'wpcm_listings_vehicle_thumbnail_size', 'wpcm_my_listings_vehicle_thumbnail_size' );


function wpcm_theme_setup_image_size() {
	add_image_size( 'wpcm-my-thumbnail', 180, 180, true );
}

add_action( 'after_setup_theme', 'wpcm_theme_setup_image_size' );