PHP pagination code_PHP tutorial

php tutorial paging code
//In order to avoid errors caused by repeated inclusion of files, a condition for determining whether the function exists:
$page = $_get[page];
if(!function_exists(pageft)){
//Define the function pageft(), the meaning of the three parameters is:
//$totle: total number of messages;
//$displaypg: The number of information displayed on each page, the default setting here is 20;
//$url: The link in the paging navigation is the same as this URL except for adding different query information "page".
//The default value should be set to the URL of this page (i.e. $_server["request_uri"]), but the right side of the default value can only be a constant, so the default value is set to an empty string, and then set to this value inside the function. page url.
function pageft($totle,$displaypg=20,$url=''){

//Define several global variables:
//$page: current page number;
//$firstcount: (database tutorial) starting item of query;
//$pagenav: page navigation bar code, it is not output inside the function;
//$_server: necessary to read the url "$_server["request_uri"]" of this page.
global $page,$firstcount,$pagenav,$_server;

//In order to make "$displaypg" here accessible from outside the function, set it as a global variable. Note that after a variable is redefined as a global variable, the original value is overwritten, so it is reassigned here.
$globals["displaypg"]=$displaypg;

if(!$page) $page=1;

//If $url uses the default value, which is an empty value, the assigned value is the url of this page:
if(!$url){ $url=$_server["request_uri"];}

//url analysis:
$parse_url=parse_url($url);
$url_query=$parse_url["query"]; //Get the query string of url separately
if($url_query){
//Because the url may contain page number information, we need to remove it in order to add new page number information.
//Regular expressions are used here, please refer to "Regular Expressions in PHP"
$url_query=preg_replace("/(^|&)page=$page/","",$url_query);

//Replace the query string of the processed url with the query string of the original url:
$url=str_replace($parse_url["query"],$url_query,$url);

//Add page query information after the url, but wait for assignment:
if($url_query) $url.="&page"; else $url.="page";
}else {
$url.="?page";
}

//Page number calculation:
$lastpg=ceil($totle/$displaypg); //The last page is also the total number of pages
$page=min($lastpg,$page);
$prepg=$page-1; //Previous page
$nextpg=($page==$lastpg ? 0 : $page+1); //Next page
$firstcount=($page-1)*$displaypg;

//Start paging navigation bar code:
$pagenav="Display number ".($totle?($firstcount+1):0)."-".min($firstcount+$displaypg,$totle). " records, $totle records in total";

//If there is only one page, jump out of the function:
if($lastpg<=1) return false;

$pagenav.=" Homepage ";
if($prepg) $pagenav.=" Previous page "; else $pagenav.=" Previous page ";
if($nextpg) $pagenav.=" Next page "; else $pagenav.=" Next page ";
$pagenav.=" Last page ";

//Pull down the jump list and list all page numbers in a loop:
$pagenav.="Go to page n";
for($i=1;$i<=$lastpg;$i++){
if($i==$page) $pagenav.="$in";
else $pagenav.="$in";
}
$pagenav.=" page of $lastpg";
}
}

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