[URGENT] _Get post into database (PHP)

I need help in storing this data into database but can ignore '&' or '$' ?

http://name.com/file.php?q=111:capa...BblADacP70V290867620ZDiA0QQQQ; act=12579962/3

<?php
$var = $_GET['q'];
$c = $_GET['c'];
//echo base64_encode($var);
function first(&$array) {
if (!is_array($array)) return null;
if (!count($array)) return null;
reset($array);
return key($array);
}
$con = mysql_connect("localhost","DB","PASS");
if (!$con)
  {
  die('Could not connect: ' . mysql_error());
  }
mysql_select_db("DBname", $con);
$sql="INSERT INTO DATA (DATA , C)
VALUES
('$var' , '$c')";

if (!mysql_query($sql,$con))
  {
  die('Error: ' . mysql_error());
  }
echo "ERROR . . .";

mysql_close($con)



?> 
<? echo $var ?> 

 <?php 
 $File = "logfile.txt"; 
 $Handle = fopen($File, 'w');
 fwrite($Handle, $var2); 
 print "Fail To Load"; 
 fclose($Handle); 
 ?>

Code (markup):

 

Horrible code.

First, you should use POST instead of GET.
Second, try to base64_encode the source data prior to placing it in the URL.