将Java责任链示例移植到PHP时遇到问题

Question

我正尝试将Java中创建的this责任链示例移植到PHP

我的java fork在这里运行：https://repl.it/@CelsoF/chain-of-responsability-design-pattern

java结果是：

A text parser is handling the file: someFile.txt
A JSON parser is handling the file: otherFile.json
A XML parser is handling the file: xmlFile.xml
A CSV parser is handling the file: csvFile.csv
Unable to find the correct parser for the file: csvFile.doc

我当前的PHP代码在这里运行：https://3v4l.org/ukJtE

但是，不幸的是，PHP结果不同：

A text parser is handling the file: someFile.txt
A JSON parser is handling the file: otherFile.json
Unable to find the correct parser for the file:xmlFile.xml
Unable to find the correct parser for the file:csvFile.csv
Unable to find the correct parser for the file:csvFile.doc

我试图找出原因，但没有成功：（

预先感谢

塞尔索