How to fetch single value from database in php

          <?php $userid = "sdfjkds83748";
	$sqlp = "SELECT * FROM `login_user` WHERE `username`='$userid '";
	 $result = mysqli_query($connection, $sqlp);
	 $row = mysqli_fetch_assoc($result);
        $usermobileno = $row['usermobileno']; echo $usermobileno;?>