I would love to have your reviews of this sign in and sign up system.You can see the main structure:For now, I have a total of 13 files (index.php, top_bar.php, header.php, container.php, footer.php, sign_in.php, sign_up.php, members.php, help.php, contact_us.php, change_theme.php, rules.php and the style.css.This is how my main page functions:index.php:<!DOCTYPE html><html lang=en-us>    <head>        <meta charset=UTF-8>        <?php        if(strpos($_SERVER[SCRIPT_FILENAME], index) !== false) { ?>        <title>Test - Forums</title>        <?php } ?>        <?php        if(strpos($_SERVER[SCRIPT_FILENAME], members) !== false) { ?>        <title>Test - Members</title>        <?php } ?>        <?php        if(strpos($_SERVER[SCRIPT_FILENAME], sign_up) !== false) { ?>        <title>Test - Sign Up</title>        <?php } ?>        <?php        if(strpos($_SERVER[SCRIPT_FILENAME], sign_in) !== false) { ?>        <title>Test - Sign In</title>        <?php } ?>        <?php        if(strpos($_SERVER[SCRIPT_FILENAME], change_theme) !== false) { ?>        <title>Test - Change Theme</title>        <?php } ?>        <?php        if(strpos($_SERVER[SCRIPT_FILENAME], contact_us) !== false) { ?>        <title>Test - Contact Us</title>        <?php } ?>        <?php        if(strpos($_SERVER[SCRIPT_FILENAME], help) !== false) { ?>        <title>Test - Help</title>        <?php } ?>        <?php        if(strpos($_SERVER[SCRIPT_FILENAME], rules) !== false) { ?>        <title>Test - Rules</title>        <?php } ?>        <link href=css/style.css rel=stylesheet type=text/css>        <link href=//maxcdn.bootstrapcdn.com/font-awesome/4.1.0/css/font-awesome.min.css rel=stylesheet type=text/css>    </head>    <body>        <?php include(top_bar.php);?>        <?php include(header.php);?>        <?php include(container.php);?>        <?php include(footer.php);?>    </body></html>This is how my main pages (top_bar.php, header.php, container.php and footer.php) are structured:top_bar.php:<!-- TOP BAR --><div id=top_bar>    <div class=wrapper>        <div id=top_bar_links>            <ul>            <?php            $full_name = $_SERVER[PHP_SELF];            $name_array = explode(/,$full_name);            $count = count($name_array);            $page_name = $name_array[$count-1];            ?>            <li id=home>                <a href=../>Home</a>            </li>            <li>                <a class=<?php echo ($page_name==index.php)?active:;?> href=.>Forums</a>            </li>            <li>                <a class=<?php echo ($page_name==members.php)?active:;?> href=members.php>Members</a>            </li>            </ul>        </div>    </div></div>header.php:<!-- HEADER --><div id=header>    <div class=wrapper>        <h1 id=logo>            <a href=.>Test</a>        </h1>        <div id=member_links>            <ul>                <li id=sign_up>                    <a href=sign_up.php>Sign Up</a>                </li>                <li id=sign_in>                    <a href=sign_in.php>Sign In</a>                </li>            </ul>        </div>    </div></div>container.php:<!-- CONTAINER --><div class=wrapper>    <div id=container>        <div id=breadcrumb_top>            <div class=breadcrumb_links>                <ul>                </ul>            </div>        </div>        <?php        if(strpos($_SERVER[SCRIPT_FILENAME], index) !== false) { ?>        <h1 style=margin-bottom: 15px;>Forums</h1>        <h3 id=category_title>Categories</h3>        <?php } ?>        <?php        if(strpos($_SERVER[SCRIPT_FILENAME], members) !== false) { ?>        <h1 style=margin-bottom: 15px;>Members</h1>        <?php } ?>        <?php        if(strpos($_SERVER[SCRIPT_FILENAME], sign_up) !== false) { ?>        <h1 style=text-align: center; margin-bottom: 15px;>Sign Up</h1>        <?php } ?>        <?php        if(strpos($_SERVER[SCRIPT_FILENAME], sign_in) !== false) { ?>        <h1 style=text-align: center; margin-bottom: 15px;>Sign In</h1>        <?php } ?>        <?php        if(strpos($_SERVER[SCRIPT_FILENAME], change_theme) !== false) { ?>        <h1 style=margin-bottom: 15px;>Change Theme</h1>        <?php } ?>        <?php        if(strpos($_SERVER[SCRIPT_FILENAME], contact_us) !== false) { ?>        <h1 style=margin-bottom: 15px;>Contact Us</h1>        <?php } ?>        <?php        if(strpos($_SERVER[SCRIPT_FILENAME], help) !== false) { ?>        <h1 style=margin-bottom: 15px;>Help</h1>        <?php } ?>        <?php if(strpos($_SERVER[SCRIPT_FILENAME], rules) !== false) { ?>        <h1 style=margin-bottom: 10px;>Rules</h1>        <p style=margin-bottom: 15px;>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Proin eu nibh turpis. Nunc sit amet auctor elit. Lorem ipsum dolor sit amet, consectetur adipiscing elit. In malesuada lobortis tempus. Integer auctor condimentum sapien, non scelerisque eros cursus et. In vel leo elementum, iaculis tellus sit amet, vestibulum quam. Etiam dapibus pulvinar risus, vestibulum rhoncus sapien commodo vitae. Etiam sit amet ultrices dui. Suspendisse luctus fringilla eros. Nam vitae metus porttitor, sagittis arcu eleifend, malesuada odio. Aliquam erat volutpat.</p>        <p style=margin-bottom: 15px;>Pellentesque id velit a elit porttitor sollicitudin et vulputate nisl. Donec eu purus non libero porta malesuada et non lorem. Vestibulum ultrices vitae elit vitae accumsan. Quisque euismod, quam sed ornare ultrices, magna mi posuere massa, vel placerat ipsum est quis erat. Aliquam non libero mauris. Etiam ligula velit, commodo et feugiat ac, porta eu orci. Donec laoreet ipsum in urna auctor, vitae malesuada nibh consequat. Donec sit amet libero vitae erat rhoncus venenatis. Maecenas nec pretium justo, eget fermentum tellus. Ut aliquet tellus venenatis posuere fermentum. Fusce mattis velit et tellus suscipit consectetur.</p>        <?php } ?>        <div id=breadcrumb_bottom>            <div class=breadcrumb_links>                <ul>                </ul>            </div>        </div>    </div></div>footer.php:<!-- FOOTER --><div class=wrapper>    <div id=footer>        <div id=footer_links>            <ul>                <li id=change_theme>                    <a href=change_theme.php>Change Theme</a>                </li>                <li id=contact_us>                    <a href=contact_us.php>Contact Us</a>                </li>                <li id=help>                    <a href=help.php>Help</a>                </li>                <li id=rules>                    <a href=rules.php>Rules</a>                </li>            </ul>        </div>        <p id=footer_copyright>Forum software coded by Dylan - 2014</p>    </div></div>What do you think? Is it good?I would like your help, as I am more knowledgable in HTML and CSS. I don't have much knowledge in PHP.
Forum Sign up and Sign in software
php;html