Pagination not taking value to second page? - php

Question

$today = date('D, d M, Y');
$sql = "SELECT * FROM table WHERE date = '$today'";
if ($_POST!="") {
$mydate = mysql_real_escape_string($_POST['datepicker']);
if ($mydate != "") {
$sql = "SELECT * FROM table WHERE date = '$mydate'";
}
}
$num_results_per_page = 8;
$num_page_links_per_page = 5;
$pg_param = "";
$result=mysql_query($sql);
$row = mysql_fetch_array($result);
pagination($sql, $num_results_per_page, $num_page_links_per_page, $pg_param);
if($pg_error == '')
{
if(mysql_num_rows($pg_result) > 0)
{
while($data = mysql_fetch_assoc($pg_result))
{
echo "";
}
echo "</br>". $pagination_output;
}
else
{
echo "No Data.";
}
}
else
{
echo $pg_error;
}
Pagination is working correctly for select $today. Here pagination is not taking value to second page in the case of select $mydate. If second page of $mydate clicks, again going to $today. ie Second click is not posting $mydate to next page. How can I take the value to second page?
pagination.php
$pg_error = '';
$pg_result = '';
$pagination_output = '';
$max_pages = '';
$page_id = '';
$page_numbers_per_page = '';
$pg_user_param = '';
function pagination($sql, $num_results_per_page, $num_page_links_per_page, $pg_param)
{
global $pg_error, $pg_result, $max_pages, $page_id, $page_numbers_per_page, $pg_user_param;
$user_sql = $sql;
$page_numbers_per_page = $num_page_links_per_page;
$results_per_page = $num_results_per_page;
$pg_user_param = $pg_param;
$all_results = mysql_query($user_sql);
if($all_results)
{
if(empty($all_results))
{
$total_results = 0;
}
else
{
$total_results = mysql_num_rows($all_results);
}
$max_pages = ceil($total_results / $results_per_page);
if(isset($_GET['page_id']))
{
$page_id = (int) $_GET['page_id'];
if($page_id > $max_pages || empty($page_id))
{
$page_id = 1;
}
}
else
{
$page_id = 1;
}
$page_id_temp = ($page_id - 1) * $results_per_page;
$sql_offset = $page_id_temp;
$user_sql .= " limit $sql_offset, $results_per_page";
$pg_result = mysql_query($user_sql);
Create_Links();
}
else
{
$pg_error = 'Error with the sql query you entered: '.mysql_error();
}
}
function Create_Links()
{
global $pagination_output, $max_pages, $page_id, $page_numbers_per_page, $pg_user_param;
$pg_page_name = htmlspecialchars($_SERVER['PHP_SELF'] );
if($max_pages > 1)
{
if($page_id > 1)
{
$first_link = 'First ';
}
if($page_id < $max_pages)
{
$last_link = 'Last ';
}
$pre_id = $page_id - 1;
if($pre_id != 0)
{
$pre_link = 'Previous ';
}
$next_id = $page_id + 1;
if($next_id <= $max_pages)
{
$next_link = 'Next ';
}
if($page_id >= $page_numbers_per_page)
{
$start_point = ($page_id - $page_numbers_per_page) + 2;
}
else
{
$start_point = 1;
}
$loop_num = ($start_point + $page_numbers_per_page) - 1;
if($loop_num > $max_pages)
{
$loop_num = $max_pages;
}
$pagination_output = '<div class="pagination"> ';
$pagination_output .= $first_link;
$pagination_output .= $pre_link;
for($i = $start_point; $i <= $loop_num; $i++)
{
if($i == $page_id)
{
$pagination_output .= '<a class="current">'.$i.'</a> ';
}
else
{
$pagination_output .= ''.$i.' ';
}
}
$pagination_output .= $next_link;
$pagination_output .= $last_link;
$pagination_output .= '</div><br />';
}
}
?>

Answer 1

function pagination in your code is not returning the resulting mysql query resource, and your code is not receiving that from the pagination function call
you need
to add return $pg_result; in your pagination function
and add $result=pagination(....
Edit:
Sorry, I noticed you added pg_result to global, which does not need return and the solution I said, but you don't need mysql_query and fetch before that and I don't see where you print the results. there is only echo "", you can try the one I edited last, and see if it works for you.
Edit:
$today = date('D, d M, Y');
$sql = "SELECT * FROM table WHERE date = '$today'";
if ($_POST!="") {
$mydate = mysql_real_escape_string($_POST['datepicker']);
if ($mydate != "") {
$sql = "SELECT * FROM table WHERE date = '$mydate'";
}
}
$num_results_per_page = 8;
$num_page_links_per_page = 5;
$pg_param = "";
//$result=mysql_query($sql);
$pg_result=pagination($sql, $num_results_per_page, $num_page_links_per_page, $pg_param);
if($pg_error == '' && is_resource($pg_result))
{
if(mysql_num_rows($pg_result) > 0)
{
while($data = mysql_fetch_assoc($pg_result))
{
var_dump($data);
}
echo "</br>". $pagination_output;
}
else
{
echo "No Data.";
}
}
else
{
echo $pg_error;
}
pagination.php
$pg_error = '';
$pg_result = '';
$pagination_output = '';
$max_pages = '';
$page_id = '';
$page_numbers_per_page = '';
$pg_user_param = '';
function pagination($sql, $num_results_per_page, $num_page_links_per_page, $pg_param)
{
global $pg_error, $pg_result, $max_pages, $page_id, $page_numbers_per_page, $pg_user_param;
$user_sql = $sql;
$page_numbers_per_page = $num_page_links_per_page;
$results_per_page = $num_results_per_page;
$pg_user_param = $pg_param;
$all_results = mysql_query($user_sql);
if($all_results)
{
if(empty($all_results))
{
$total_results = 0;
}
else
{
$total_results = mysql_num_rows($all_results);
}
$max_pages = ceil($total_results / $results_per_page);
if(isset($_GET['page_id']))
{
$page_id = (int) $_GET['page_id'];
if($page_id > $max_pages || empty($page_id))
{
$page_id = 1;
}
}
else
{
$page_id = 1;
}
$page_id_temp = ($page_id - 1) * $results_per_page;
$sql_offset = $page_id_temp;
$user_sql .= " limit $sql_offset, $results_per_page";
$pg_result = mysql_query($user_sql);
Create_Links();
return $pg_result;
}
else
{
$pg_error = 'Error with the sql query you entered: '.mysql_error();
}
}
function Create_Links()
{
global $pagination_output, $max_pages, $page_id, $page_numbers_per_page, $pg_user_param;
$pg_page_name = htmlspecialchars($_SERVER['PHP_SELF'] );
if($max_pages > 1)
{
if($page_id > 1)
{
$first_link = 'First ';
}
if($page_id < $max_pages)
{
$last_link = 'Last ';
}
$pre_id = $page_id - 1;
if($pre_id != 0)
{
$pre_link = 'Previous ';
}
$next_id = $page_id + 1;
if($next_id <= $max_pages)
{
$next_link = 'Next ';
}
if($page_id >= $page_numbers_per_page)
{
$start_point = ($page_id - $page_numbers_per_page) + 2;
}
else
{
$start_point = 1;
}
$loop_num = ($start_point + $page_numbers_per_page) - 1;
if($loop_num > $max_pages)
{
$loop_num = $max_pages;
}
$pagination_output = '<div class="pagination"> ';
$pagination_output .= $first_link;
$pagination_output .= $pre_link;
for($i = $start_point; $i <= $loop_num; $i++)
{
if($i == $page_id)
{
$pagination_output .= '<a class="current">'.$i.'</a> ';
}
else
{
$pagination_output .= ''.$i.' ';
}
}
$pagination_output .= $next_link;
$pagination_output .= $last_link;
$pagination_output .= '</div><br />';
}
}
?>

Answer 2

Looks like you're mixing up the concept of $_POST and $_GET.
By having your pagination links point to '<a href="'.$pg_page_name.'?page_id='.$i . $pg_user_param.'"... You should be intercepting $_GET['page_id'] before you make your SQL query.
Your top code references $_POST['datepicker'] but you don't mention a form anywhere and your pagination links certainly aren't posting that data in your example.

Answer 3

You should use $pg_param = ""; to pass your own query parameters. Ex: &date=$date_value:
$pg_param = "&date=$date_value";