php - array - Illegal string offset -

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I am trying to display a single value from an array of values. If I use print_r ($ arr) then this value shows 

  {"a": 14, "b": 3, "c": 61200, "d": ["2014- 04-22 12:00:06 "," 2014-04-23 12:00:06 "," 2014-04-24 12:00:06 "]}   
 but when I changed my code to  echo $ arr-> An attempt was made to use a  and  $ arr ['a']  it shows invalid string offset 'a' . How to get a single value from an array of values?   
 
 
 looks like json first  
  $ d = '{"a": 14, "b": 3, "c": 61200, "d": ["2014-04-22 12:00:06", "2014 -04-23 12:00:06" , "2014-04-24 12:00:06"]} '; $ J = json_decode ($ d); Echo '& lt; Pre & gt; '; Print_r ($ j); Counterpart $ j-> A;

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