PHP - Broken Pagination Script

<?php
	/*
		Place code to connect to your DB here.
	*/
	include('config.php');	// include your code to connect to DB.

	$tbl_name="";		//your table name
	// How many adjacent pages should be shown on each side?
	$adjacents = 3;
	
	/* 
	   First get total number of rows in data table. 
	   If you have a WHERE clause in your query, make sure you mirror it here.
	*/
	$query = "SELECT COUNT(*) as num FROM $tbl_name";
	$total_pages = mysql_fetch_array(mysql_query($query));
	$total_pages = $total_pages[num];
	
	/* Setup vars for query. */
	$targetpage = "filename.php"; 	//your file name  (the name of this file)
	$limit = 2; 								//how many items to show per page
	$page = $_GET['page'];
	if($page) 
		$start = ($page - 1) * $limit; 			//first item to display on this page
	else
		$start = 0;								//if no page var is given, set start to 0
	
	/* Get data. */
	$sql = "SELECT column_name FROM $tbl_name LIMIT $start, $limit";
	$result = mysql_query($sql);
	
	/* Setup page vars for display. */
	if ($page == 0) $page = 1;					//if no page var is given, default to 1.
	$prev = $page - 1;							//previous page is page - 1
	$next = $page + 1;							//next page is page + 1
	$lastpage = ceil($total_pages/$limit);		//lastpage is = total pages / items per page, rounded up.
	$lpm1 = $lastpage - 1;						//last page minus 1
	
	/* 
		Now we apply our rules and draw the pagination object. 
		We're actually saving the code to a variable in case we want to draw it more than once.
	*/
	$pagination = "";
	if($lastpage > 1)
	{	
		$pagination .= "<div class=\"pagination\">";
		//previous button
		if ($page > 1) 
			$pagination.= "<a href=\"$targetpage?page=$prev\">� previous</a>";
		else
			$pagination.= "<span class=\"disabled\">� previous</span>";	
		
		//pages	
		if ($lastpage < 7 + ($adjacents * 2))	//not enough pages to bother breaking it up
		{	
			for ($counter = 1; $counter <= $lastpage; $counter++)
			{
				if ($counter == $page)
					$pagination.= "<span class=\"current\">$counter</span>";
				else
					$pagination.= "<a href=\"$targetpage?page=$counter\">$counter</a>";					
			}
		}
		elseif($lastpage > 5 + ($adjacents * 2))	//enough pages to hide some
		{
			//close to beginning; only hide later pages
			if($page < 1 + ($adjacents * 2))		
			{
				for ($counter = 1; $counter < 4 + ($adjacents * 2); $counter++)
				{
					if ($counter == $page)
						$pagination.= "<span class=\"current\">$counter</span>";
					else
						$pagination.= "<a href=\"$targetpage?page=$counter\">$counter</a>";					
				}
				$pagination.= "...";
				$pagination.= "<a href=\"$targetpage?page=$lpm1\">$lpm1</a>";
				$pagination.= "<a href=\"$targetpage?page=$lastpage\">$lastpage</a>";		
			}
			//in middle; hide some front and some back
			elseif($lastpage - ($adjacents * 2) > $page && $page > ($adjacents * 2))
			{
				$pagination.= "<a href=\"$targetpage?page=1\">1</a>";
				$pagination.= "<a href=\"$targetpage?page=2\">2</a>";
				$pagination.= "...";
				for ($counter = $page - $adjacents; $counter <= $page + $adjacents; $counter++)
				{
					if ($counter == $page)
						$pagination.= "<span class=\"current\">$counter</span>";
					else
						$pagination.= "<a href=\"$targetpage?page=$counter\">$counter</a>";					
				}
				$pagination.= "...";
				$pagination.= "<a href=\"$targetpage?page=$lpm1\">$lpm1</a>";
				$pagination.= "<a href=\"$targetpage?page=$lastpage\">$lastpage</a>";		
			}
			//close to end; only hide early pages
			else
			{
				$pagination.= "<a href=\"$targetpage?page=1\">1</a>";
				$pagination.= "<a href=\"$targetpage?page=2\">2</a>";
				$pagination.= "...";
				for ($counter = $lastpage - (2 + ($adjacents * 2)); $counter <= $lastpage; $counter++)
				{
					if ($counter == $page)
						$pagination.= "<span class=\"current\">$counter</span>";
					else
						$pagination.= "<a href=\"$targetpage?page=$counter\">$counter</a>";					
				}
			}
		}
		
		//next button
		if ($page < $counter - 1) 
			$pagination.= "<a href=\"$targetpage?page=$next\">next �</a>";
		else
			$pagination.= "<span class=\"disabled\">next �</span>";
		$pagination.= "</div>\n";		
	}
?>

	<?php
		while($row = mysql_fetch_array($result))
		{
	
		// Your while loop here
	
		}
	?>

<?=$pagination?>
	

<?php
  //CORS header
  header("Access-Control-Allow-Origin: *");


  //Capture parameter
  
  $create = $_POST['create'];
  $fuser = $_POST['fuser'];




 if (!file_exists("uploads/$fuser/$create"));
 {
 if ($f = fopen("uploads/$fuser/$create", 'w')) {
    fwrite($f, 1);
    fclose($f);
    echo 'OK';
     }


  }     
  else
{
  $f = fopen("uploads/$fuser/$create", 'w')
   fwrite($f, 5);
    fclose($f);
    echo 'FAIL' ;
}


 
?>

<?php
  //CORS header
  header("Access-Control-Allow-Origin: *");


  //Capture parameter
  
  $create = $_POST['create'];
  $fuser = $_POST['fuser'];




 if (!file_exists("uploads/$fuser/$create"));
 {
 if ($f = fopen("uploads/$fuser/$create", 'w')) {
    fwrite($f, 1);
    fclose($f);
    echo 'OK';
     }


  }

I copied the code for password_hash at php.net:

	<?php
/**
 * In this case, we want to increase the default cost for BCRYPT to 12.
 * Note that we also switched to BCRYPT, which will always be 60 characters.
 */
$options = [
    'cost' => 12,
];
echo password_hash("rasmuslerdorf", PASSWORD_BCRYPT, $options);
?>
	

and changed it for use in my login page:

	$options = ['cost' => 12,];
    $user = mysqli_real_escape_string($db_link,$_GET['username']);
    $pass = password_hash($_GET['password'], PASSWORD_BCRYPT, $options);
	

but my page keeps saying invalid user/pass. Upon echoing the $pass I find that the result changes EACH time. so I created a test page that runs the code from php.net (verbatim code) 20x and I got:

[pre]

 $2y$10$Nlf0J520viR4C5jd3nIdd.6M3OMKACx503Jm3PiXDYZIs.13XAheq
$2y$10$SO1ip3JI.EGjUJb3JYUDSeAUszg6A3UBX9b.ENk2aythAuxQ1apxS
$2y$10$Ub7cQSbFWXhkLrzm3ldGGe8FfgsOjS99vgj9l801yqXgPjvJmVpsm
$2y$10$8fNzz/tmrg8tLdHOk0r7GOh0j1frKN3ujA/qzrFHi/s22jMO/hbri
$2y$10$o.5LnDxkhw/YNxJT16fuIOiQbnhHKs51SqFTqQ3KsflY6nYV.HLLm
$2y$10$zQZiauRe6tuF2rGd1XGcO.E7ekhfP68Sqih8ll9Om7n5c2NO3tPSu
$2y$10$uLZXDAQu14EW8P4CMMICBuvRv0wOEAxghzJV1c9UuNK7yTRJNNdjO
$2y$10$P6Uy4/PDOnE9zv/VxRAWFebKY/qYXj1unIrTvV42xUxe.zXx3ut2W
$2y$10$uHb8qdh3CGe0BkXdyuThHu0vgAH5bxEPYMe0VK410Q7xqcAlC.xuy
$2y$10$xXwbec0Cn0JcMorGgmmRY.qHW.N1pNoYq.2V.IAQHsCDYPXtgQyJ6
$2y$10$w88m.M6BmVVoYYBhM1IAquOIb4NH9n093nQmdzhKm0Fq2ykgcZFZm
$2y$10$IkVTs7.z4rZt5/rkgRQnKeXfINb7VTqXxTDRZB9caR4X0rwKtdhIW
$2y$10$XyjX0X0I.l4Ct9eF4zhhz.S5Cg/Ppqf3veL9ciehjBr/2Rp8usPCm
$2y$10$iJkhIWl95TVlA4hw2nltd./YmyXA2.abqTu8WFs/YuEvJsndosv6W
$2y$10$kwVNtAaKxG8z2m.D0evl..Xx64NWPxbFAIBjCDLBfgiJncgniBB7S
$2y$10$m8ZyiI7HhXutyTZGySit/O3lmAGsIlfRqEcYc7eCV2XS9TS1Sw9/y
$2y$10$uYDilXy1HKT9M6DiPUhAe.3W5teCpkTF4x5UgVYiJctz4HXNMzU9e
$2y$10$0HDD2quyh2AfMeF41PbKTu7PGTPn2fcl42HLxweaIHay9KbPDrEh6
$2y$10$qc0Kt5VtkrslpLlQmvq5a.dboTbf8qEif9KOwYwjoGGh6Q.xoN8JK

[/pre]

Is password_hash broken? or am I mistaken to think that it's supposed to return the same output everytime fror the same input?

If I have a web page located he

www . company . com / how-to-repair-your-computer.html

And I decide to re-structure my website like this

www . company . com / articles / how-to-repair-your-computer.html

How do I make sure that people don't search and end up at the old, now broken, link?

It seem inevitable that as a website grows, that you will want to re-organize things.  What is the best way to make sure that anyone who searches or clicks on an old link - say from an email from a friend - doesn't get a 404 error?

Also, how do you avoid ruining a web pages rank on Google after you move things?  (I think if the URL changes, Google makes you start all over as far as getting listed on page-1 and all of that?

Is this something I have to hande on my end, or is it a Google issue, or something else?