android - Why is this a bad MYSQL query in PHP? -


Is this a bad mysql query that I used in php? 

  $ tablenamep = $ _POST ["tablenamep"]; $ Res = mysqli_query ($ con, "SELECT * FROM $$ tablenamep` where number = 9");   
 So when I try to get the result using:  
  while ($ row = mysqli_fetch_assoc ($ res))   
 There is a SQL injection error:  mysqli_fetch_assoc () parameter 1 is expected to be mysqli_result, given the boolean   
 I have many questions about this error and The answer is read, but my question is that is a boolean returning query when I added a value for the $ tablenamep variable. I added the value to the variable from my Android app using this code:  
  nameValuePairs.add (New BasicNameValuePair ("tablenamep", msg));   
 The code is working and there is no error, but when I try to get results of php, my Android app is crashing. How can I solve this! (Note: Nothing wrong in my Android app, I have checked it completely)  
 Why is this a bad query? What can I do for the query to not return the bullion, and return the original value?   
 
 
 I think your  $ res = mysqli_query ($ con, "SELECT * FROM  $ tablenamep  WHERE number = 9 ");  Return fails.  
  Technical Details Table   
 
 For successful selection, show, details, or explore query will return a mysqli_result object. For other successful questions, this truth will come back to failure.   
 The mysqli_fetch_assoc () function requires mysqli_result but the query fails to return the boolean instead of the object.

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