Help Me Debug this.

So I am trying to make nav links for my website... I.E a Previous and Next hyperlink to navigate to the next page. Problem is my code isnt working right.

This is the PHP code from my index.php page..

<?php
$page = $_GET['page'];
urlencode($page);
if($page > ""){
	include($page);
	$base_url = 'http://' .$_SERVER['HTTP_HOST'];
	$full_path = $_GET['page'];
	$base = dirname($full_path);
	$page_file = basename($full_path);
	$page_num = substr($page_file
	, strrpos($page_file, "_") + 1
	, strpos($page_file, ".php") - strrpos($page_file, "_") - 1
	);
	$partial_path = substr($page_file, 0, strrpos($page_file, "_"));

	print "<p>base_url=[$base_url]</p>\n";
	print "<p>full_path=[$full_path]</p>\n";
	print "<p>base=[$base]</p>\n";
	print "<p>page_file=[$page_file]</p>\n";
	print "<p>page_num=[$page_num]</p>\n";
	print "<p>partial_path=[$partial_path]</p>\n";
	
	$prev_page_file = $partial_path . "_" . (string)($page_num-1) . ".php";
	$next_page_file = $partial_path . "_" . (string)($page_num+1) . ".php";
	
	print "<p>prev_page_file=[$prev_page_file]</p>\n";
	print "<p>next_page_file=[$next_page_file]</p>\n";
	
	$prev_full = "/" . $base . "/" . $prev_page_file;
	$next_full = "/" . $base . "/" . $next_page_file;
	print "<p>$prev_full</p>\n";
	print "<p>$next_full</p>\n";

	if (file_exists($prev_full) ==TRUE )
		{
		print "<a href=\"$base/$prev_page_file\">previous</a>";
		if (file_exists($next_full) == TRUE)
			{
			print " | ";
			}
		}
	if (file_exists($next_full) == TRUE)
		{
		print "<a href=\"$base/$next_page_file\">next</a>";
		}
	else {
		print "does not exist";
		}
	}
	Else{
	include('main_1.php');
} 
?>

Code (markup):

Basically what happens is when the user goes to the main page it pulls the page main_1.php... now since its dynamic whenever someone goes to another page it loads that page.... The output I get from my debuggin shows this....

so all the variables are getting the right information... but the file_exists() function is not finding the file... thus printing the debug info "does not exist"... I can tell you the next file does exist! What is wrong in my code?

 

one thing i can suggest is avoid using capitalized "TRUE" ... instead use "true"

in PHP TRUE != true both are having diffrent meaning ...

I hope this hint will help you

 

One more thing


if (file_exists($prev_full) ==TRUE )

rather than this just use

if (file_exists($prev_full))

because file_exists returns true if file is present else false... so no need to do comparison in if