Check password length in php

I have written function to check password length in php



function passwordLength($pwd)
    $pwdlen=strlen($pwd);//calculate length of password using strlen function

      if($pwdlen<=4) //if length of password is less than 4 then password is too short.
         return "Password too short!";
    else if ($pwdlen>16) //if length of password is greater than 16 then password is too Long.
         return "Password too Long!";