Pagination in PHP/MySQL

[shanzay]

ARGHHHHH pagination, again? I know!

 

OK here is a code that I worked on to get a grocery store items list displayed in a table in a paginated design. Everything is working fine except I don't know how to dynamically display auto incremented indexID range on that particular page, like 1-10 11-20 21-30 31-40 and so on (something like amazon items in cart)  instead of page numbers << < 1 2 3 4 > >> as pagination hyperlink to move between different pages. Any help will be greatly appreciated.

 

 

<?php
// database connection info
$conn = mysql_connect('host','user','password') or trigger_error("SQL", E_USER_ERROR);
$db = mysql_select_db('dbName',$conn) or trigger_error("SQL", E_USER_ERROR);

// find out how many rows are in the table 
$sql = "SELECT COUNT(*) FROM store";
$result = mysql_query($sql, $conn) or trigger_error("SQL", E_USER_ERROR);
$r = mysql_fetch_row($result);
$numrows = $r[0];

// number of rows to show per page
$rowsperpage = 10;
// find out total pages
$totalpages = ceil($numrows / $rowsperpage);

// get the current page or set a default
if (isset($_GET['currentpage']) && is_numeric($_GET['currentpage'])) {
   // cast var as int
   $currentpage = (int) $_GET['currentpage'];
} else {
   // default page num
   $currentpage = 1;
} // end if

// if current page is greater than total pages...
if ($currentpage > $totalpages) {
   // set current page to last page
   $currentpage = $totalpages;
} // end if
// if current page is less than first page...
if ($currentpage < 1) {
   // set current page to first page
   $currentpage = 1;
} // end if

// the offset of the list, based on current page 
$offset = ($currentpage - 1) * $rowsperpage;

// get the info from the db 
$sql = "SELECT indexID, item, price FROM store LIMIT $offset, $rowsperpage";
$result = mysql_query($sql, $conn) or trigger_error("SQL", E_USER_ERROR);

// while there are rows to be fetched...
echo "<p><table><tr><td><strong>Item</strong></td><td><strong>Price</strong></td></tr>";
while ($list = mysql_fetch_assoc($result)) {
   echo "<tr>";
   echo "<td>" . $list['item'] . "</td>";
   echo "<td>$" . $list['price'] . "</td>";
   echo "</tr>";
} // end while
echo "</table></p><br /><br />";


/******  build the pagination links ******/
// range of num links to show

$range = 3;

// if not on page 1, don't show back links
if ($currentpage > 1) {
   // show << link to go back to page 1
   echo " <a href='{$_SERVER['PHP_SELF']}?currentpage=1'><<</a> ";
   // get previous page num
   $prevpage = $currentpage - 1;
   // show < link to go back to 1 page
   echo " <a href='{$_SERVER['PHP_SELF']}?currentpage=$prevpage'><</a> ";
} // end if 

// loop to show links to range of pages around current page
for ($x = ($currentpage - $range); $x < (($currentpage + $range) + 1); $x++) {
   // if it's a valid page number...
   if (($x > 0) && ($x <= $totalpages)) {
      // if we're on current page...
      if ($x == $currentpage) {
         // 'highlight' it but don't make a link
         echo " <b>$x</b> ";
      // if not current page...
      } else {
         // make it a link
         echo " <a href='{$_SERVER['PHP_SELF']}?currentpage=$x'>$x</a> ";
      } // end else
   } // end if 
} // end for
                 
// if not on last page, show forward and last page links        
if ($currentpage != $totalpages) {
   // get next page
   $nextpage = $currentpage + 1;
    // echo forward link for next page 
   echo " <a href='{$_SERVER['PHP_SELF']}?currentpage=$nextpage'>></a> ";
   // echo forward link for lastpage
   echo " <a href='{$_SERVER['PHP_SELF']}?currentpage=$totalpages'>>></a> ";
} // end if
/****** end build pagination links ******/
?>

[QuickOldCar]

Just wrote this up for you to make ranges of pages.

 

<?php
function pageRange($page_number,$page_amount){
if($page_amount == ""){
$page_amount = 10;
}
$page_high = $page_number *$page_amount;
$page_low = $page_high -$page_amount +1;
$page_range = "$page_low-$page_high";
return $page_range;
}

//usage
$page_number = 1;
$page_amount = 10;
$page_range = pageRange($page_number,$page_amount);
echo $page_range;
?>

[QuickOldCar]

I made a little demo with ranges of pages and groups of items.

 

http://get.blogdns.com/dynaindex/page-range.php

 

<?php
$page = mysql_real_escape_string($_GET['page']);
if (!isset($_GET['page']) or !is_numeric($_GET['page'])) {
$page = 1;
}
$range = range(1,10);

function pageRange($page_number,$page_amount=NULL){
if($page_amount == ""){
$page_amount = 10;
}
$page_high = $page_number *$page_amount;
$page_low = $page_high -$page_amount +1;
$page_range = "$page_low-$page_high";
return $page_range;
}


foreach($range as $page_number){
$page_range = pageRange($page_number,$page_amount);
echo "<a href='page-range.php?page=$page_number'>$page_range</a> ";
}
echo "<br />";
echo "Now on page $page, viewing items ".pageRange($page)."<br />";
?>

[shanzay]

QuickOldCar, thanks but somehow the code is not working the way I want it to work

 

Only this part is changing:

1-10 11-20 21-30 31-40 41-50 51-60 61-70 71-80 81-90 91-100

Now on page 9, viewing items 81-90,

 

while the page stays the same, i.e. only first 10 items on the list are displayed on each click.

 

It's also giving an error that $page_amount is an undefined variable.

 

If you look at amazon.com cart with more than 10 items in it, you will know what exactly I am talking about.

[QuickOldCar]

The code was to give you ideas of how to go about achieving this with your code, not a drop in solution.

 

Your values are different. You need to use your page number values, the total posts, amounts per page and href style links.