how to send information from one page to another page using anchor tag

<?php 
							mysql_connect("localhost","root","");
mysql_select_db("mydatabase");
$sql="SELECT * FROM user";
$result=mysql_query($sql);
							while($row=mysql_fetch_array($result))							{

echo '<a  href="user_profile.php?variableName='.$row['userid'].'" style="text-decoration:none">'.$row['username'].'</a></form>';
}
?>

<?php
mysql_connect("localhost","root","");
mysql_select_db("mydatabase");
$sql="SELECT * FROM user where userid=".$_GET['variableName'];
$result=mysql_query($sql);
							while($row=mysql_fetch_array($result))							{
echo 'username:'.$row['name'];

}
?>