function bbp_number_not_negative( $number = 0 ) {

	// Protect against formatted strings
	if ( is_string( $number ) ) {
		$number = strip_tags( $number );                    // No HTML
		$number = preg_replace( '/[^0-9-]/', '', $number ); // No number-format

	// Protect against objects, arrays, scalars, etc...
	} elseif ( ! is_numeric( $number ) ) {
		$number = 0;
	}

	// Make the number an integer
	$int = intval( $number );

	// Pick the maximum value, never less than zero
	$not_less_than_zero = max( 0, $int );

	// Filter & return
	return (int) apply_filters( 'bbp_number_not_negative', $not_less_than_zero, $int, $number );
}