Post 1:N (one customer many phonenumbers) JSON Array to android and parse it in PHP

I want to create a more complex JSON Array where a customer (which has a name) has many phonenumbers so that i can parse it in PHP and i need your help.

i.e.:

public Class ContactVO
{
    public String diplayname;
    public ArrayList<PhoneVO> phonenumbers = new ArrayList<PhoneVO>();
}


public Class PhoneVO
{
    public String number;
}
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Can s.o. give me an example how to create the above 1:N structure as JSON Array and how to parse it via PHP?

I put everything in a ArrayList and added the GSON library to may project.

The result is:

[
  {"contact_id":"1","displayname":"Bjyyyyy","phonenumbers":[{"number":"066-6228"}]},  
  {"contact_id":"2","displayname":"Rainer Unsinn","phonenumbers":[{"number":"(066) 214-52"}]},
  {"contact_id":"3","displayname":"Dieter karpenstein","phonenumbers":[{"number":"06621716669"}]},
  {"contact_id":"4","displayname":"Sido","phonenumbers":[{"number":"(085) 011-1555"}]},
  {"contact_id":"5","displayname":"Jochen Müller","phonenumbers":[{"number":"01773313261"}]}
]
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How should the receiving PHP File lookslike to parse that?