PHP - MySQL results to JSON -


I am trying to convert a MySQL result to a JSON format so that I can later use this JSON Javascript to create an HTML table. Although my code produces very nil values ​​and why I am still not understood. 

  $ result = mysqli_query ($ con, "select from clients"); $ test = json_encode ($ result); Print $ test; Output:  
  {"current_field": null, "field_count": zero, "length": blank, "num_rows": empty, "type ": null}   
 I have fields like, for example," customer ID "and" name ", and even they do not even appear in JSON results.  
 What am I doing wrong? Thanks   
 
 
  $ result = mysqli_query ($ con, "select from customers"); While ($ line = mysqli_fetch_assoc ($ result)) $ test [] = $ line; Print json_encode ($ test);

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