<?php

function generatePagination(int $totalPages, int $displayPages, int $currentPage){
	if($displayPages%2===0){
		throw new Exception('Pass only odd no in display pages!');
	}
	$previousPages = [];
	$nextPages = [];
	$prev= $currentPage - (($displayPages+1)/2);
	for($i= $prev+1; $i<$currentPage;$i++){
		if($i<1){
			continue;
		}
		$previousPages[] = $i;
	}
	print_r($previousPages);
	$next = $displayPages - count($previousPages);
	print_r($next);
	print_r($currentPage);
	$next = $currentPage + $next;
	print_r($next);
	for($i= $currentPage+1; $i< $next; $i++){
		$nextPages[] = $i;
	}
	print_r($nextPages);
	return array_merge($previousPages, [$currentPage], $nextPages);
}

$pages = generatePagination(50, 11, 1);

print_r($pages);