function f_login($f_uname, $f_password)
{
    $f_id = f_id_from_username($f_uname);
    $f_uname = sanitize($f_uname);
    $f_password = md5($f_password);
    $query = mysql_query("SELECT COUNT(`f_id`) FROM `flight_users` WHERE `f_uname`= '{$f_uname}' AND `f_password` = '{$f_password}'");
    return mysql_result($query, 0) == 1 ? $f_id : false;
}
<?php

$title = 'Swift Airlines | Profile';
include $_SERVER["DOCUMENT_ROOT"] . '/swift/core/init.php';
user_protect_page();
include $_SERVER["DOCUMENT_ROOT"] . '/swift/includes/overall/header.php';
if (isset($_GET['f_uname']) === true && empty($_GET['f_uname']) === false) {
    $f_uname = $_GET['f_uname'];
    if (f_exists($f_uname) === true) {
        $f_id = f_id_from_username($f_uname);
        $profile_data = f_data($f_id, 'f_fname', 'f_lname', 'f_mailid', 'f_sex', 'f_regdate');
        ?>

<h4><?php 
        echo $profile_data['f_fname'];
        ?>
&#39;s Profile</h4>

<br/>
<div class="container">
<img src="http://localhost/<?php 
        echo $profile_data['f_dp'];
        ?>
" height="150" width="150" />
</div>
<hr>

<strong>Name:</strong> <?php 
        echo $profile_data['f_fname'] . ' ' . $profile_data['f_lname'];
        ?>
<br/><br/>