This filter is applied within the bcn_breadcrumb_trail class in the
display_loop() function just before assembling the breadcrumb string. This filter was introduced in version 7.2. It receives four parameters:
- $separator – (string)(required) The separator to place after the current breadcrumb.
- $position – (integer)(optional) The current breadcrumb position at the current depth in the breadcrumb trail
- $last_position – (integer)(optional) The last possible position at this depth of the breadcrumb trail (size of the breadcrumb trail at this depth)
- $depth – (integer)(optional) The current depth (dimension/level) within the breadcrumb trail