Php/docs/function.filter-id
From Get docs
filter_id
(PHP 5 >= 5.2.0, PHP 7)
filter_id — Returns the filter ID belonging to a named filter
Description
filter_id
( string $name
) : int|false
Parameters
name
- Name of a filter to get.
Return Values
ID of a filter on success or FALSE
if filter doesn't exist.