So I wrote this script, and it works when i dont bind the "Random_Key" and use it as it is, but when I bind the key with bindParam() I am getting a error. Can you see whats going wrong?

PHP Code:

<?php
//Fetches Random_Key from email to use in binding
$Random_Key $_GET['c'];

    
//Sets other variables for later use
    
$ERRmsg "";
    
$validCount 0;
    
        
//Opens a connection to MySQL
        
try {
            
$wdp = new PDO('mysql:host=localhost; dbname=***********''***********''******');
            
$wdp->setAttribute(PDO::ATTR_ERRMODEPDO::ERRMODE_EXCEPTION);
                
//prepare the SQL statement
                
$sth $wdp->prepare(
                
"SELECT
                user_email,
                Active
                FROM
                Users
                WHERE
                Random_Key = :key
                "
);
                
                    
//binds the key for safety
                    
$sth->bindParam(':key'$Random_Key);
                
                    
//Excutes the SQL statement
                    
$sth->execute();

                        
//Sets the statement into an array
                        
$result $sth->fetch(PDO::FETCH_ASSOC);
                            
$active $result[Active];
                            
$email $result[user_email];
                        
                            
//Checks if account already active
                            
if($active == 1$ERRmsg .= "You have already confirmed this account. <br/>";
                            if(
$active == 3$ERRmsg .="Your account has been disabled for securty reasons, contact the Web Admin for more info";
                                
                                
//checks to see if error message is empty, if so continues if not throws error
                                
if(empty($ERRmsg))
                                {
                                    
//If everything passes connects back to Database and updates to make account active
                                    
$update $wdp->prepare(
                                    
"UPDATE
                                    Users
                                    SET
                                    Active = '1'
                                    Where
                                    Random_Key= :key
                                    "
);
                                    
                                                        
//binds the key for safety
                                                        
$sth->bindParam(':key'$Random_Key);

                                        
//Exectures the update
                                        
$update->execute();
                                        echo (
"<p>Your account has been confirmed!");
                                }
                                    else
                                    {
                                        echo 
$ERRmsg;
                                    }
            
            }
            catch (
PDOException $ex) {
            
$msg $ex->errorInfo;
            
error_log(var_export($msgtrue));
            die(
"<p>Sorry, there was an unrecoverable database error. Debug data has been logged.</p>");
                                                    };
?>