Catching data on the php side from ajax -

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I am confused how can I get value on the php side after passing data from AJAX? Basically, I had data in an object array. When data passes through Ajax, do I pass it as stride array or objectarrere? Does it mean that I need to wire?

I am doing this in MVC, so this is the test in the URL 

   key = value      
 
 
  
  data: {foo: StringArray}   
 and  
  $ _ POST ['foo']   
 instead.

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