php - How to create an "add_filter" function if "filter name" is in the form of "$filter" in apply_filters? -

in following wp php code:

function bbp_get_topic_post_count( $topic_id = 0, $integer = false ) {         $topic_id = bbp_get_topic_id( $topic_id );         $replies  = (int) get_post_meta( $topic_id, '_bbp_reply_count', true ) + 1;         $filter   = ( true === $integer ) ? 'bbp_get_topic_post_count_int' : 'bbp_get_topic_post_count';          return apply_filters( $filter, $replies, $topic_id );     } 

i change "$replies" using filters. since there "apply_filters" above, think it's possible add "add_filter". seems filter name "$filter"

function bbp_reply_count_modified( $replies, $topic_id ) {             $topic_id = bbp_get_topic_id( $topic_id );             $replies  = (int) get_post_meta( $topic_id, '_bbp_reply_count', true ); // deleted '+ 1'             return $replies; add_filter( '___________________', 'bbp_reply_count_modified', 10, 2 ); 

in case, how can create "add_filter" function?

thanks help.

the filter name, based on methods second parameter $integer, either bbp_get_topic_post_count_int (when $integer true) or bbp_get_topic_post_count (when $integer false, default parameter value of $integer, if there isn't value @ method call).

the value of $filter assigned here:

$filter = ( true === $integer ) ? 'bbp_get_topic_post_count_int' : 'bbp_get_topic_post_count'; 

therefore, don't need modify method, should search usage of method see input parameter $integer given.

to use filter $integer = true, use:

add_filter( 'bbp_get_topic_post_count_int', 'bbp_get_topic_post_count', 10, 2 ); 

to use filter $integer = false, use:

add_filter( 'bbp_get_topic_post_count', 'bbp_get_topic_post_count', 10, 2 );