pagination next and previous button - php

Question

hello guys can you help me out ?
i have a problem in pagination
i just want to disable the next and previous
button in my pagination if it is
no item left
$db_host = "localhost";
$db_username = "root";
$db_pass = "";
$db_name = "final";
$con= mysqli_connect("$db_host","$db_username","$db_pass") or die ("could not connect to mysql");
mysqli_select_db($con, "final") or die ("no database");
$pagination_sql = "SELECT * FROM `ongoing` WHERE approved='approve'";
$run_pagination = mysqli_query($con, $pagination_sql);
$count = mysqli_num_rows($run_pagination);
$total_pages = ceil($count/$per_page);
echo "<ul class='pagination'>";
echo "<li class='page-item'><a class='page-link' href='ongoing.php?page=".($page-1)."' class='button'>
<span aria-hidden='true'>«</span>
<span class='sr-only'>Previous</span>
</a></li>";
for($i=1;$i<=$total_pages;$i++){
echo'<li><a class="page-link" href="ongoing.php?page='.$i.'">'.$i.'</a></li>';
};
echo "<li class='page-item'><a class='page-link' href='ongoing.php?page=".($page+1)."' class='button'>
<span aria-hidden='true'>»</span>
<span class='sr-only'>Next</span>
</a></li>";
echo "</ul>";
?>
and here's the condition of per page
$per_page = 10;
if(isset($_GET['page'])){
$page = $_GET['page'];
}else{
$page= 1;
}
$start_from = ($page-1) * $per_page;

Answer 1

I think you just need to adjust your code as below:
echo "<ul class='pagination'>";
if($page == 1) {
$disable_prev = 'disabled';
$prev_url = "javascript:void(0);";
} else {
$disable_prev = '';
$prev_url = "ongoing.php?page=".($page-1);
}
echo "<li class='page-item ".$disable_prev."'><a class='page-link' href='".$prev_url."' class='button'>
<span aria-hidden='true'>«</span>
<span class='sr-only'>Previous</span>
</a></li>";
for($i=1;$i<=$total_pages;$i++){
echo'<li><a class="page-link" href="ongoing.php?page='.$i.'">'.$i.'</a></li>';
};
if($page+1 == $total_pages) {
$disable_next = '';
$next_url = "ongoing.php?page=".($page+1);
} else {
$disable_next = 'disabled';
$next_url = "javascript:void(0);";
}
echo "<li class='page-item ".$disable_next."'><a class='page-link' href='".$next_url."' class='button'>
<span aria-hidden='true'>»</span>
<span class='sr-only'>Next</span>
</a></li>";
echo "</ul>";
Then you can also add some CSS to make disabled li little visible or faded than other

Answer 2

Try:
if($i != NULL){ //NULL or Empty
//Code here
}