includes/class-freemius.php
function has_filter( $tag, $function_to_check = false ) {
            $this->_logger->entrance( $tag );

            return has_filter( $this->get_action_tag( $tag ), $function_to_check );
        }
function has_filter( $tag, $function_to_check = false ) {
            $this->_logger->entrance( $tag );

            return has_filter( $this->get_action_tag( $tag ), $function_to_check );
        }
function has_filter ( $ tag , $ function_to_check = false ) { $ this -> _logger -> entrance ( $ tag ) ; return has_filter ( $ this -> get_action_tag ( $ tag ) , $ function_to_check ) ; }
Check if has filter.

@author Vova Feldman (@svovaf)
@since  1.1.4

@param string        $tag
@param callable|bool $function_to_check Optional. The callback to check for. Default false.

@return false|int

@uses   has_filter()
Check if has filter .