Breadcrumb: change links depending on where I am - php

Question

I would like to know how I can do to change the links depending on where I am on my site?
For example, I would like that when I click on "Sign In", it is like this:
Forums > Sign In
http://prntscr.com/47d04a
container.php:
<div class="wrapper">
<div id="container">
<div id="breadcrumb_top">
<div class="breadcrumb_links">
<ul>
<li class="forums">
Forums
</li>
</ul>
</div>
</div>
<?php
if(strpos($_SERVER["REQUEST_URI"], "index") !== false) {
echo "<h1 style='margin-bottom: 15px;'>Forums</h1>";
/* Code here. */
}
?>
<?php
if(strpos($_SERVER["REQUEST_URI"], "members") !== false) {
echo "<h1 style='margin-bottom: 15px;'>Members</h1>";
/* Code here. */
}
?>
<?php
if(strpos($_SERVER["REQUEST_URI"], "sign_up") !== false) {
echo "<h1 style='margin-bottom: 15px;'>Sign Up</h1>";
/* Code here. */
}
?>
<?php
if(strpos($_SERVER["REQUEST_URI"], "sign_in") !== false) {
echo "<h1 style='margin-bottom: 15px;'>Sign In</h1>";
/* Code here. */
}
?>
<?php
if(strpos($_SERVER["REQUEST_URI"], "change_theme") !== false) {
echo "<h1 style='margin-bottom: 15px;'>Change Theme</h1>";
/* Code here. */
}
?>
<?php
if(strpos($_SERVER["REQUEST_URI"], "contact_us") !== false) {
echo "<h1 style='margin-bottom: 15px;'>Contact Us</h1>";
/* Code here. */
}
?>
<?php
if(strpos($_SERVER["REQUEST_URI"], "help") !== false) {
echo "<h1 style='margin-bottom: 15px;'>Help</h1>";
/* Code here. */
}
?>
<?php
if(strpos($_SERVER["REQUEST_URI"], "rules") !== false) {
echo "<h1 style='margin-bottom: 15px;'>Rules</h1>";
/* Code here. */
}
?>
<div id="breadcrumb_bottom">
<div class="breadcrumb_links">
<ul>
<li class="forums">
Forums
</li>
</ul>
</div>
</div>
</div>
</div>
I would like that everything be automated depending on where I am. If I click on "Members" in the top_bar, I would like that "Forums" in the breadcrumb should be replaced by "Members", etc.
Thanks.

Answer 1

At the top of my pages I'll create some PHP variables or constants that describe what the page name, parent and title are and then use a function to determine what page I'm on by what's defined/set.
This is an idea of what it's like.
<?php
define('PARENT','Blog'); // the site section/parent
define('PAGE','Posts'); // the child page under the site section
$page_title = 'My Blog'; // the page's title
function active($str, $submenu='') {
if(!defined(PARENT) || !defined(PAGE)) {
return false;
}
if($submenu) {
if($str == PARENT) {
return ' visible';
}
} else {
if($str == PARENT || $str == PAGE) {
return ' class="active selected"';
}
}
return false;
}
echo $page_title;
?>
<ul class="submenu<?php echo active('Blog', 'submenu') ?>">
<li<?php echo active('Posts') ?>>
Posts
</li>
</ul>