Strong or Secure Password Using PHP Code

User Registration

UserName:

Password:

$username=$_REQUEST['username'];
$password=$_REQUEST['userPassword'];
//$retype=$_REQUEST['retypePassword'];

if($_REQUEST['submit']=="login")
{
if($password)
{
if(preg_match("/^.*(?=.{8,})(?=.*[a-z]+)(?=.*[^A-Za-z0-9])(?=.*[0-9\.\-\@\#\$\&]).*$/",$password))

{
echo "Successfuly checked your password";

}
else
{
echo "Please Enter"."
"."Atleast 8 character"."
"."Alpha numeric value"."
"."1 Special character";
}
}

else
{
echo "Password field can not be empty";
}
}

?>