Hadoop-who knows where MapReduce PHP interface implementation code is?

Mapreduce has a php interface. Ask who knows the underlying source code. If you want to learn, some php and java interactive mapreduce has a php interface. Ask who knows the underlying source code, want to learn
There may be some php and java interactions.

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Mapreduce has a php interface. Ask who knows the underlying source code and want to learn about it.
There may be some php and java interactions.

Write Hadoop MapReduce program in PHP

Languages without standard interfaces are implemented through standard input/output calls, because hadoop streaming

For other information, see hadoop streaming in section 3rd of Chapter 2nd of the hadoop authoritative guide.