Having some trouble in my pagation code(PHP) - php

Question

My table is posting and in that table, it shows all the posting people put in.
I am trying to make page navigation links at the bottom of the posts.
the function generateenter code here_page_links does all the work.
The code seem to be only showing the "<-" and "->" and not the link numbers. I think the function is only reading the $_GET['posting'] ==1.
(this code is from the Oreilly PHP/MySQL book. I am using it as practice)
function generate_page_links($cur_page, $num_pages) {
$page_links = '';
// If this page is not the first page, generate the "previous" link
if ($cur_page > 1) { //cur_page is just a number that is gotten from the url.
$page_links .= '<-- ';
}
else {
$page_links .= '<- ';
}
// Loop through the pages generating the page number links
for ($i = 1; $i <= $num_pages; $i++) {
if ($cur_page == $i) {
$page_links .= ' ' . $i;
}
else {
$page_links .= ' ' . $i . '';
}
}
// If this page is not the last page, generate the "next" link
if ($cur_page < $num_pages) {
$page_links .= ' ->';
}
if ($cur_page == $num_pages){ //the last page
$page_links .= ' ->';
}
return $page_links; //need to return this variable in the function
}
// Calculate pagination information
$cur_page = isset($_GET['page']) ? $_GET['page'] : 1;
$results_per_page = 3; // number of results per page
$skip = (($cur_page - 1) * $results_per_page);
$query = "SELECT * FROM posting ORDER BY date_added DESC";
$data = mysqli_query($dbc, $query);
$total = mysqli_num_rows($data);
$num_pages = ceil($total / $results_per_page);
//Query again to get just the subset of results
$query = $query . " LIMIT $skip, $results_per_page";
$result = mysqli_query($dbc, $query);
echo '<table>';
echo '<tr><td><b>Title</b></td><td><b>Date Posted</b></td></tr>';
while ($row = mysqli_fetch_array($result)) {
echo '<tr><td><a href="ad.php?
posting_id='.$row['posting_id'].'
">'.$row['title'].'</a></td>';
echo '<td>'.$row['date_added'].'</td>';
//echo '<td>'.$row['name'].'</td></tr>';
}
echo '</table>';
// Generate navigational page links if we have more than one page
if ($num_pages > 1) {
echo generate_page_links($user_search, $sort, $cur_page, $num_pages);
}

Answer 1

Well you have some problems here to start with:
You call the function with 4 variables
echo generate_page_links($user_search, $sort, $cur_page, $num_pages);
But the function only accepts two
function generate_page_links($cur_page, $num_pages)
If that's the code you're using, then it's probably going to crash because those variables are undefined.
Try deleting "$user_search, $sort," and see if that fixes it?