| Name | Lines of code | Maintainability | Test coverage |
| src/RdKafka/Message.php | 102 | B 4 hrs | B 89% |
| src/RdKafka/Metadata.php | 103 | A 0 mins | A 95% |
| src/RdKafka/Metadata/Broker.php | 27 | A 0 mins | A 100% |
| src/RdKafka/Metadata/Collection.php | 38 | A 0 mins | A 100% |
| src/RdKafka/Metadata/Partition.php | 39 | A 35 mins | B 87% |
| src/RdKafka/Metadata/Topic.php | 27 | A 0 mins | A 100% |
| src/RdKafka/Producer.php | 64 | A 0 mins | B 83% |
| src/RdKafka/ProducerTopic.php | 97 | A 3 hrs | A 90% |
| src/RdKafka/Queue.php | 58 | A 0 mins | B 81% |
| src/RdKafka/Test/ApiKey.php | 50 | A 0 mins | F 0% |
| src/RdKafka/Test/MockCluster.php | 186 | A 0 mins | D 68% |
| src/RdKafka/Topic.php | 46 | A 0 mins | A 90% |
| src/RdKafka/TopicConf.php | 115 | B 5 hrs | C 77% |
| src/RdKafka/TopicPartition.php | 88 | A 0 mins | A 100% |
| src/RdKafka/TopicPartitionList.php | 78 | A 0 mins | A 94% |
| src/functions.php | 31 | A 0 mins | B 85% |