PHP array array function implements PHP paging

//php paging code
$array=array("1","2","3","4","5","6","7","8 ","9","10","11","12","13","14","15","16","17","18","19","20") ;//Specify the array to be paged
$page= $_GET['page'];
 $r = $this->page($array,5,$page);
 print_r($r);
 exit( );
 foreach($r["source"] as $s){
 echo $s;
 }
function page($array,$pagesize,$current){
 $_return=array();
 $total= ceil(Count($array)/$pagesize);//Find the total number of pages
 $prev=(($current-1)<=0 ? "1":($current-1));//Confirm One page, if the current page is the first page, click to display the first page
 $next=(($current+1)>=$total ? $total:$current+1);//Confirm the next page, if The current page is the last page, click the next page to display the last page
 $current=($current>($total)?($total):$current);//If the current page is greater than the total number of pages, the current page is the last One page
 $start=($current-1)*$pagesize;//When displaying in pages, how many pieces of information should be read from? for($i=$start;$i<($start+$pagesize);$ i++){
 array_push($_return,$array[$i]);//Put the displayed information into the array $_return
 }
 $pagearray["source"]=$_return;
 $pagearray["page "]="first prev next end";//The pagination style can be adjusted as needed
 return $ pagearray;
}