PHP pagination not working - php

Question

i making paging from table using the following code my table name is category and 2nd one posts and the one with sit setting setting
<div id="wrap">
<div class="container" style="margin-top:50px;">
<div class="row">
<?php
$per_page =8;
if (!isset($_GET['page']))
{
$page = 1;
}
else
{
$page = (int)$_GET['page'];
}
$start_f = ($page-1) * $per_page;
$query = mysqli_query($conn, " SELECT * FROM `posts` p INNER JOIN `users` u
WHERE p.p_author = u.u_id AND `p_category` = '$_GET[category]' ORDER BY `p_id` DESC LIMIT $start_f , $per_page" );
while ( $post = mysqli_fetch_assoc($query)) {
# code...
?>
<div class="col-xs-12 col-sm-6 col-md-3" style="margin-top: 20px;">
<div class="col-item" >
<div class="post-img-content">
<img src="<?php echo $post['p_image']; ?>" style="width: 100%; height: 100%;" class="img-responsive" />
<span class="post-title">
<b class="pull-left"><?php echo $post['p_title']?></b>
</span>
</div>
<div>
<div class="info" >
<div class="row ">
<div class="col-md-12"></div>
<div class="price col-md-6">
<h5><b><?php echo $post['p_category'];?></b></h5>
</div>
<div class=" hidden-sm col-md-6">
<h5 style="text-align: right;"><a href="admin-cp/profile.php?user=<?php echo $post['u_id']; ?>"><b ><?php echo
$post['u_name'];?></b></a></h5>
</div>
<div class=" hidden-sm col-md-12">
<h5><b>Date : </b><?php echo $post['p_date'];?></h5>
</div>
</div>
<div class="separator clear-left">
<p style="text-align: left;">
<i class="fa fa-eye"></i>View</p>
</div>
<div class="clearfix">
</div>
</div>
</div>
</div>
</div>
<?php
}
$page_sql = mysqli_query($conn, "SELECT * FROM
`posts` WHERE `p_category` = '$_GET[category]'");
$count_page = mysqli_num_rows($page_sql);
$total_page = ceil($count_page/$per_page); /// cail for make value int
?>
<nav class="text-center">
<ul class="pagination">
<?php
for($i = 1 ; $i <= $total_page; $i++)
{
echo '<li '.($page==$i ? 'class="active"' : '').' >'.$i.'</li>';
}
?>
</ul>
</nav>
</div>
this http://localhost/p/category.php?category=Computers work and get me the first page but that http://localhost/p/category.php?category=Computers?page=1 give me 0 result
pleas help me it's very important to me

Answer 1

You link concatenation is wrong, use & instead of ? again:
<?php
}
$page_sql = mysqli_query($conn, "SELECT * FROM
`posts` WHERE `p_category` = '$_GET[category]'");
$count_page = mysqli_num_rows($page_sql);
$total_page = ceil($count_page/$per_page); /// cail for make value int
?>
<nav class="text-center">
<ul class="pagination">
<?php
for($i = 1 ; $i <= $total_page; $i++)
{
echo '<li '.($page==$i ? 'class="active"' : '').' >'.$i.'</li>';
}
?>