Realize the processing of ten pages forward and ten pages back_PHP tutorial

/*==== Display data records in pages =====
One page has ten consecutive page connections
One page can display $limit_row record information
It also has the function of turning the next ten pages and the previous ten pages
================================== ===

------You need to pass in the value $total_row;$limit_row;$pagename;-----
$total_row is the total number of rows in the selected query results
$ limit_row is the maximum number of rows displayed on each page
$pagename is the name of the returned display page. (without suffix)
----------------------------------------- ----------

--------------------------------- -------------------
$page The page currently being read
$total_page is the number of pages that can be divided into.
$row_begin is the starting number Start reading the row
$row_end is the number of rows read
-------------------------------- ---------------------*/

if (!$page){ $page=1;}
$total_page=ceil( $total_row/$limit_row);
$row_begin=$limit_row*($page-1);
if($page==$total_page&&($total_row%$limit_row)){
$read_row=( $total_row%$limit_row);
}else{$read_row=$limit_row;}
if($total_page<=10){
$page_begin=0;
$page_end=$total_page;
$page10=1;
$newpage10=1;
}else{
//--------------Paging displays the next ten pages----- -----------
// $page10 is how many ten pages there are in total
// $newpage10 is the starting position of reading ten pages
// $page_endx is reading The last number of pages

$page10=ceil($total_page/10);
if($newpage10 ===""){$newpage10=1;}
$page_begin=10*($ newpage10-1);
if($newpage10==1)
{
if($newpage10==($page10-1)&&($total_page%10))
{
$page_endx=$total_page%10; =11">Next $page_endx page |";
}else{
$page_end=10;
echo "Next ten pages |";
}
}elseif($newpage10>1){
if($newpage10==$page10&&($total_page%10))
{$page_end=$total_page%10;
echo "| Previous Ten pages |The last $page_end page|";
}else{
if($newpage10==($page10-1)&&($total_page%10) )
{ $page_endx=$total_page%10;
$page_end=10;
echo "| First ten pages | Next $page_endx page |";
} else{
$page_end=10;
echo "| First ten pages | Next ten pages |";
}
}

}
}

//----------------------Page number every ten pages------------- --------------------------
echo "Total: ".$total_row." Article ";
for ($n= $page_begin+1;$n<=$page_begin+$page_end;$n++){
echo "$n ";
}
echo "page";

?>