Problem with Fatal error: Call to undefined function logged_in()

[trollster]

Hello all, I am getting the above error while I was trying to make a login system.

These are my codes.

        
		<!-- Website Navigation Bar placed here -->
	
		<div class="container">
			<div class="navbar navbar-inverse">
				<div class="navbar-inner">
					<div class="container" style="width: auto">       
						<a class="btn btn-navbar" data-toggle="collapse" data-target=".nav-collapse">
							<span class="icon-bar"></span>
							<span class="icon-bar"></span>
							<span class="icon-bar"></span>
						</a>
						<div class="nav-collapse collapse">
						<ul class="nav">
							<li><a href="http://ankursinha.net/tofsis/index.php"><strong>Home</strong></a></li>
							<li><a href="http://ankursinha.net/tofsis/index.php"><strong>Downloads</strong></a></li>
						</ul> 
<?php 
	if(logged_in() === true) 
	{
		include $_SERVER["DOCUMENT_ROOT"].'/tofsis/faculty_logged_in.php';
	} 
	else 
	{
		include $_SERVER["DOCUMENT_ROOT"].'/tofsis/logged_out.php'; 
	}
?>					

Based on whether the person is logged in or not, the dropdown changes. Those codes are below.

If logged in:

							<ul class="nav pull-right" role="navigation">
		    					<li class="dropdown">
		    						<a href="#" id="link1" role="button" class="dropdown-toggle" data-toggle="dropdown">
		    							<strong>Hi, <?php echo $user_data['faculty_fname']; ?></strong>
		    							<b class="caret"></b>
		    						</a>
		    						<ul class="dropdown-menu" role="menu">
		    							<li><a href="changepass.php">Change Password</a></li>
		    							<li><a href="logout.php">Log Out</a></li>
		    						</ul>
		    					</li>
							</ul>
                        </div>
                    </div>
                </div>
            </div>
        </div>

If not logged in:

							<ul class="nav pull-right" role="navigation">
		    					<li class="dropdown">
		    						<a href="#" id="link1" role="button" class="dropdown-toggle" data-toggle="dropdown">
		    							<strong>Hi, <?php echo $user_data['faculty_fname']; ?></strong>
		    							<b class="caret"></b>
		    						</a>
		    						<ul class="dropdown-menu" role="menu">
		    							<li><a href="flogin.php">Faculty Login</a></li>
		    							<li><a href="slogin.php">Student Login</a></li>
		    						</ul>
		    					</li>
							</ul>
                        </div>
                    </div>
                </div>
            </div>
        </div>

And this is my logged in function:

function logged_in() {
		return (isset($_SESSION['faculty_id'])) ? true : false ;
	}

Thing is no matter I am logged in or not, I still get the same error.

Here is the site link: http://ankursinha.net/tofsis/

Please help me solve this problem. The code ran perfectly on my localhost having PHP 5.3, but I am facing problem on the webserver having PHP 5.3 though I think the version is not the problem here.

[SpacePhoenix]

You need to either include or require the file containing the logged_in() function before you can use it

[trollster]

I have done that bro

[rickschmidt]

Where have you started the session? You should have the code session_start(); at the top of every page that you use it on, otherwise you can't access the session data.
Even though PHP reads your code for functions before it calls them, its general best programming practice to define the functions above where you call them. Where is the include for this function?

Also, you mention that your web host has PHP 5.3 installed. Make sure its running that version using the php_info(); function. I know with my experience that some hosts have 5.3 off by default (but have it installed) which you need to enable via an .htaccess file. If this is the case the following .htaccess code should be used in the root directory:

#Use PHP 5.3
AddType application/x-httpd-php53 .php

With what you have posted it is hard to tell what the issue is. Please post more code in context for further assistance.

Hope this helps,
Rick

[trollster]

I have started the session on top of init.php page, init.php page requires the connect.php, functions.php

And I checked with phpinfo(), it shows 5.3 only, nevertheless I will add that code to my .htaccess file.

And now I am getting this error: Fatal error: Allowed memory size of 65011712 bytes exhausted (tried to allocate 40961 bytes) in /home/ankursvo/public_html/tofsis/init.php on line 2

Line 2 contains ob_start() and the next line contains session_start()