Dynamic array radio button Help

[runnerme]

Hi everyone im newbie here..

can anyone help me to solve this problem. i have a problem with this code i create a function that get the value of dynamic radio button ,,please check my code.

><?php

	global $conn;
	$a= array(); 

	$conn->cursorlocation = 3; 

	$query = "SELECT * FROM tbquestion";

	$rs = $conn->execute($query);

	if (!$rs)
		echo "fdsaf";
	else {		
	$num_columns = $rs->Fields->Count();
	$n=1;
		while (!$rs->EOF)  

	 {
	//$num =  $rs->fields['QuestionID'];
	$numID =  $rs->fields['id'];
	$num1 =  $rs->fields['Question'];
	$a[$n] =  $rs->fields['a'];
	$b[$n] =  $rs->fields['b'];
	$c[$n]=  $rs->fields['c'];


		echo  "$n.";
		//echo $num;
		echo "&nbsp;&nbsp;";
		echo $num1;
		echo "<br>";
		echo "&nbsp;&nbsp;";
		echo "<input name='$a[$n]' type='radio' value='$a[$n]'>$a[$n]";
		echo "&nbsp;&nbsp;";
		echo "<input name='$a[$n]' type='radio' value='$b[$n]'>$b[$n]";
		echo "&nbsp;&nbsp;";
		echo "<input name='$a[$n]' type='radio' value='$c[$n]'>$c[$n]";
		echo "&nbsp;&nbsp;";
		echo "<br>";
		echo "<br>";
		$n=$n + 1;
		$rs->MoveNext(); //move on to the next record	
	}


	$rs->Close();

	$rs = null;


function checks(){
		global $a;
		global $n;
		global $conn;
		$conn->cursorlocation = 3; 

	$querys = "SELECT * FROM tbquestion";
	$rs1 = $conn->execute($querys);


	$num_columns1 = $rs1->Fields->Count();

	$n=1;
		while (!$rs1->EOF)  
	 {
	$ans =  $rs1->fields['answer'];

	$selected_radio=$_POST['$a[$n]']; 

	   if (($selected_radio)==$ans)
      {
	  	$n1=$n1+1;
		}
	$n2=$n2+1;
	$rs1->MoveNext(); //move on to the next record	
	}



	echo "Your Score is " . $n1;
}		


	if (isset($_POST['Submit'])){
			checks();
	}	

}

?>

[Bonesnap]

And what problem would that be?

[runnerme]

i cant get the value of the radio button