php+mysql paging query code and demonstration example

//In order to avoid errors caused by repeated inclusion of files, a condition is added to determine whether the function exists:
if(!function_exists(pages)){
//Define function pages (), the meanings of the three parameters are:
//$total: the total number of information;
//$displaypg: the number of information displayed on each page, the default setting here is 20;
//$url: the link in the paging navigation, Except for adding different query information "page", the other parts are the same as this URL.
//The default value should be set to the URL of this page (i.e. $_SERVER["REQUEST_URI"]), but the right side of the default value can only be a constant, so the default value is set to an empty string, and then set to inside the function. URL of this page.
function pages($total,$displaypg=20,$url=''){
//Define several global variables:
//$page: current page number;
//$ firstcount: the starting item of (database) query;
//$pagenav: page navigation bar code, it is not output inside the function;
//$_SERVER: read the URL of this page“$_SERVER["REQUEST_URI"]&rdquo ; Necessary.
global $page,$firstcount,$pagenav,$_SERVER;
//In order to make the "$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;
$page=$_GET['page'];
if(!$page) $page=1;
//if $ If the url uses the default value, which is a null value, then the value is assigned to 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 the URL separately
if($url_query){
//Because the URL may contain page number information, It needs to be removed so that new page number information can be added.
//Regular expression
$url_query=ereg_replace("(^|&)page=$page","",$url_query);
//Query of the processed URL String replaces the query string of the original URL:
$url=str_replace($parse_url["query"],$url_query,$url);
//Add page query after the URL Information, but to be assigned:
if($url_query) $url.="&page"; else $url.="page";
}else {
$url.="?page";
}
//Page number calculation:
$lastpg=ceil($total/$displaypg); //The last page is also the total page number
$page=min($lastpg,$page);
$prepg=$ page-1; //Previous page
$nextpg=($page==$lastpg ? 0 : $page+1); //Next page
$firstcount=($page-1)*$displaypg;< /p>
//Start paging navigation bar code:
$pagenav="Display the ".($total?($firstcount+1):0)."- ".min($firstcount+$displaypg,$total)." records, total $total records";
//If If there is only one page, the function will jump out:
if($lastpg<=1) return false;
$pagenav.=" Homepage< /a> ";
if($prepg) $pagenav.=" Previous page "; else $pagenav.=" Previous page";
 if($nextpg) $pagenav.=" Next page "; else $pagenav.=" Next page";
$pagenav.=" < ;a href='$url=$lastpg'>Last page ";
//Pull down the jump list and loop through all page numbers:
$pagenav.= "Go ton";
for($i=1;$i<= $lastpg;$i++){if($i==$page) $pagenav.="$in";
else $pagenav.="< ;option value='$i'>$in";
}
$pagenav.=" page of $lastpg";
}
}
?>< /p>

2. Mysql paging call demonstration:

$DatabaseServer="localhost";
$UserName="root";
$PassWord="";
$DatabaseName="dede";
$conn=mysql_connect($DatabaseServer,$UserName,$PassWord) or die("Database connection error"+mysql_error());
mysql_select_db($DatabaseName,$conn);
 mysql_query("set names gbk ");
include("Pages.php"); //Include“pages.php”file
//Get the total number of information
$result=mysql_query("select * from dede_area ");
$total=mysql_num_rows($result);
//Call pages() to display 10 pieces of information per page (when using the default 20, this parameter can be omitted), use URL of this page (default, so omitted).
pages($total,10);
//Use global variables
$result=mysql_query("select * from dede_area limit $firstcount,$displaypg ");
while($row= mysql_fetch_array($result)){
//(list content omitted)
echo($row['eid']);
echo ($row['name']);
echo ("");
} +mysql paging effect, as shown in the figure:


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