PHP pagination loop issue - php

Question

I tried to make a PHP pagination like this:
$count = $this->dataBaseFunctions->countItems();
$resultperPage = 10;
$offset = 0;
$adjacents = 3;
$totalPages = ceil(intval($count) / $resultperPage);
if (isset($_GET['offset'])) {
$offset = trim($_GET['offset']);
}
$j = $adjacents;
while ($j > 0) {
if (($offset / 10) - 1 > 0) {
echo '' . ($offset - 10 - ($j * 10)) . ' ';
}
$j--;
}
/*for ($j = $adjacents; $j > 0; $j--) {
echo '' . ($offset - 10 - ($j * 10)) . ' ';
}*/
echo '[' . ($offset - 10) . '] ';
for ($j = 1; $j < ($adjacents + 1); $j++) {
echo '' . ($offset - 10 + ($j * 10)) . ' ';
}
The result should look like this (Brackets = current clicket page):
[0] 1 2 3
When I click "3" it should look like this (works so far):
0 1 2 [3] 4 5 6
But when I click "1" the result looks like this:
-2 -1 0 [1] 2 3 4
The "0" is not a problem, I just 'echoed' it for debugging.
I know that I dont set the right conditions for not showing pages below 1 but I dont get it how to make it right. Seems like I have tomatoes on my eyes... The echo is just for testing - later I save the whole pagination links into a variable to assign it to the bottom of the page. Its a bit of debugging code you see here but it shows what I try to do. Please let me know if I can improve the question or if there are missing informations like: "why you do ($offset / 10) -1 > 0" ;-)
Later I need to do same stuff in JS but I think I can manage that, when I know what I did wrong in the PHP version.
*Maybe it's a bad Idea what I try to do there?

Answer 1

This one should do the trick:
Now including the $adjacents
$count = $this->dataBaseFunctions->countItems();
$resultperPage = 10;
$offset = 0;
$adjacents = 3;
$totalPages = ceil(intval($count) / $resultperPage);
if (isset($_GET['offset'])) {
$offset = trim($_GET['offset']);
}
$start = ($offset-$adjacents) > 0 ? ($offset-$adjacents) : 0;
$end = ($offset+$adjacents) < $totalPages ? ($offset+$adjacents) : $totalPages;
$pager = "";
for ($i = 0; $i < $totalPages; $i++) {
if ($i >= $start && $i <= $end) {
$pager .= $offset != $i ? '' . $i . ' ' : "[$i] ";
}
}
echo $pager;