inventarioSustancias/public_html/navbar.php

<nav class="navbar navbar-expand-xlg">
	<div class="navbar-header">
		<a class="navbar-title" href="/menu">OPASO</a><br>	
		<!-- logo -->
		<!-- <img class="navbar-logo" src="https://cdn.shopify.com/s/files/1/0533/2089/files/placeholder-images-image_large.png?v=1530129081"> -->
	</div>

	<!-- links -->
	<div class="link-wrapper">
		<ul class="navbar-nav">
			<li class="nav-item"><a class="nav-link" href="/menu">Menu</a></li>

			<?php
				/* generate link for current page */
				if(basename($_SERVER["PHP_SELF"]) !== "menu.php"){
					$current = basename($_SERVER["PHP_SELF"]);
					$base = explode(".",$current)[0];
					$title = ucwords(implode(" ",explode("-",$base)));

					if($base !== "laboratory" and $base !== "inventory"){
						echo '<li class="nav-item menu-link"><a class="nav-link" href="/' . $base . '">' . $title . '</a></li>';
					
					}
					
					/* lab or inventory */
					else{
						if($base === "inventory"){
							echo '<li class="nav-item menu-link"><a class="nav-link arg-link" href="/laboratory">Laboratory</a></li>';
						}

						echo '<li class="nav-item menu-link arg-link-wrapper"><a class="nav-link arg-link" href="/' . $base . '">' . $title . '</a></li>';
					}
				}
			?>

		</ul>

		<!-- user menu -->
		<div class="um-wrapper" id="dropdownMenuLink" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
			<div class="user-menu">
				<a class="user nav-link" href="#"><span class="user-name"><?php echo $_SESSION["person_name"]; ?></span><i class="um-icons dropdown-icon fas fa-caret-down"></i></a>
				<div class="dropdown-menu dropdown-menu-right">
					<span class="dropdown-item logout">Log Out <i class="um-icons fas fa-sign-out-alt"></i></span>
				</div>
			</div>
		</div>
	</div>
</nav>