A general method to implement data paging in PHP

function show_page($count,$page,$page_size)
{
 $page_count = ceil($count/$page_size); //Calculate the total number of pages
 $init=1;
 $page_len=7 ;
 $max_p=$page_count;
 $pages=$page_count;
 //Judge the current page number
 $page=(empty($page)||$page<0)?1:$page;
 //Get the current page url
 $url = $_SERVER['REQUEST_URI'];
 //Remove the original page parameter in the url to add the new page parameter
 $parsedurl=parse_url($url);
 $url_query = isset($parsedurl['query ']) ? $parsedurl['query']:'';
 if($url_query != ''){
 $url_query = preg_replace("/(^|&)page=$page/",'',$ url_query);
 $url = str_replace($parsedurl['query'],$url_query,$url);
 if($url_query != ''){
 $url .= '&';
 }
 } else {
 $url .= '?';
 }
 //Paging function code
 $page_len = ($page_len%2)?$page_len:$page_len+1; //Number of page numbers
 $pageoffset = ($page_len-1 )/2; //The left and right offset of the page number
 $navs='';
 if($pages != 0){
 if($page!=1){
 $navs.="Homepage "; //First page
 $navs.="Previous page"; //Previous page
 } else {
 $navs .= "Homepage ";
 $navs .= "Previous page";
 }
 if($pages>$page_len)
 {
 //If the current page is less than or equal to the left Shift
 if($page<=$pageoffset){
 $init=1;
 $max_p = $page_len;
 }
 else //If the current page is greater than the left offset
 {
 //If the current page number’s right offset exceeds Maximum number of pages
 if($page+$pageoffset>=$pages+1){
 $init = $pages-$page_len+1;
 }
 else
 {
 //Calculation when both left and right offsets exist
 $ init = $page-$pageoffset;
 $max_p = $page+$pageoffset;
 }
 }
 }
 for($i=$init;$i<=$max_p;$i++)
 {
 if($i= =$page){$navs.="".$i.'';}
 else {$navs.=" ".$i."";}
 }
 if($page!=$pages)
 {
 $navs.=" < ;a href="".$url."page=".($page+1)."">Next page ";//Next page
 $navs.="Last page"; //Last page
 } else {
 $navs .= "Next page";
 $navs .= "Last page";
 }
 echo "$navs";
 }
}

Pagination, PHP