if ( count( $masterIDs ) < count( $slaveIDs ) ) {
$missingIDs = array_diff( $slaveIDs, $masterIDs );
if ( count( $missingIDs ) ) {
if ( count( $masterIDs ) < count( $slaveIDs ) ) {
$missingIDs = array_diff( $slaveIDs, $masterIDs );
if ( count( $missingIDs ) ) {