I'm trying to compare shadow password with php cli but not work ! i use this function so i can create password like shadow

function shadow ($input){
         for ($n = 0; $n < 9; $n++){
              $s .= chr(rand(64,126));
         }
         $seed =  "$1$".$s."$";
         $return = crypt($input,$seed);
    return $return;
}

when i replace the result in shadow it's work with the password but it's have different character how i can compare it .

thanks