Table pagination not going to a different page when selected - php

Question

I added pagination to a table a I created a while back and I have not ever been able to get it to work correctly since.
The table limit works, but that's it. If I select "First, Last or the page number" it just reloads the page, but the new page does not display.
If I set the page limit to a low number like 5 and select 'Last Page', when the page loads it shows =1 like it doesn't know there are other pages.
<?php
$con = mysqli_connect("localhost","root","","bfb");
$per_page=20;
if(isset($_POST["page"])) {
$page = $_POST["page"];
}
else {
$page = 1;
}
//Page will start from 0 and multiply per page
$start_from = ($page-1)*$per_page;
//Selecting the data from the table but with limit
$query = "SELECT * FROM orders LIMIT $start_from, $per_page";
$result = mysqli_query($con, $query);
?>
<table class="tableproduct">
<tr>
<th class="thproduct">Order ID</th>
<th class="thproduct">Customer Name</th>
<th class="thproduct">Product</th>
<th class="thproduct">Total Price</th>
<th class="thproduct"></th>
<th class="thproduct"></th>
</tr>
<?php
if( $result ){
while($row = mysqli_fetch_assoc($result)) :
?>
<form method="POST" action="orderhistory.php">
<tr>
<td class="tdproduct"><?php echo $row['order_id']; ?> </td>
<td class="tdproduct"><?php echo $row['customer_name']; ?> </td>
<td class="tdproduct"><?php echo $row['product_name']; ?> </td>
<td class="tdproduct"><?php echo $row['total_price']; ?> </td>
<td class="tdproduct"><a href='editorderhistory.php?id=<?php echo $row['id']; ?>'>EDIT</a></td>
<input type="hidden" name="product_id" value="<? echo $row['id']; ?>"/>
<td class="tdproduct"><input name="delete" type="submit" value="DELETE "/></td>
</tr>
</form>
<?php
endwhile;
}
?>
</table>
<?php
//Count the total records
if ($result != false) {
$total_records = mysqli_num_rows($result);
if ($total_records == 0) {
echo 'No results founds.';
}
}
//Using ceil function to divide the total records on per page
$total_pages = ceil($total_records /$per_page);
?>
<span class="spandarkblue">
<?php
//Going to first page
echo "<center><a href='orderhistory.php?page=1'>".'First Page'."</a> ";
for ($i=1; $i<=$total_pages; $i++) {
echo "<a href='orderhistory.php?page=".$i."'>".$i."</a> ";
};
// Going to last page
echo "<a href='orderhistory.php?page=$total_pages'>".'Last Page'."</a></center>";
?>
Any ideas?

Answer 1

Found below issues in you code.
1) You are trying to get page value from URL using POST, where as you need to GET method to fetch values from URl. Using POST is returning null value, so $page value is always set to 1
So use $_GET["page"] instead of $_POST["page"]
2) You are preparing pagination by considering row count of the query which you are executing. But as you have added limits , your $total_records is always equals to $per_page value or less, resulting in only one page number.
Use the following code for generate pazination
$query1 = "SELECT count(*) as totalRecords FROM orders";
$result1 = mysqli_query($con, $query1);
if ($result1) {
$row1 = mysqli_fetch_assoc($result1);
$total_records = $row1['totalRecords'];
if ($total_records == 0) {
echo 'No results founds.';
}
}
Instead of below code
if ($result != false) {
$total_records = mysqli_num_rows($result);
if ($total_records == 0) {
echo 'No results founds.';
}
}
Hope it helps you.

Answer 2

You need to fetch all the data to know the total of your records, then you show only the desired data whithin a for() loop, so remove LIMIT $start, $per_page from your query, in this node you will always have 20 or less results
In your while() save the data in arrays like this:
$index = 0;
while($row = mysqli_fetch_assoc($result)) {
$ordID[$index] = $row["order_id"];
// The rest of your data...
$index++; // Increment the index
}
Then you chan show only the desired data:
for($i = (($page-1)*$perPage); $i < min(($page*$perPage), $total); $i++) {
echo $orderID[$i];
// And so on...
}
The min() function returns the lowest value between two vars, in this way in the last page, if you have 17 products instead of 20 you will not have errors.