A very good PHP page turning class_PHP tutorial

Copy code The code is as follows:

/*
* Created on 2007-6-8
* Programmer: Alan , Msn - haowubai@hotmail.com
* bkJia.com Develop a project PHP - MySQL - Apache
* Window - Preferences - PHPeclipse - PHP - Code Templates
*/
//In order to avoid errors caused by repeated inclusion of files, a condition is added to determine whether the function exists:
if(!function_exists(pageft)){
//Define the function pageft(), the meanings of the three parameters are: :
//$totle: the total number of information;
//$displaypg: the number of information displayed on each page, the default setting here is 20;
//$url: the link in the paging navigation, in addition to adding different The query information other than "page" is the same as this URL.
// The default value should be set to the URL of this page (i.e. $_SERVER["REQUEST_URI"]), but the right side of the default value can only be a constant, so the default value is set to an empty string, and then inside the function Set as the URL of this page.
function pageft($totle,$displaypg=20,$url=''){

//Define several global variables:
//$page: current page number;
/ /$firstcount: The starting item of the (database) query;
//$pagenav: The page navigation bar code, which is not output inside the function;
//$_SERVER: Read the URL of this page "$_SERVER ["REQUEST_URI"]" required.
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 $url uses the default value, which is empty, then Assign the value to the URL of this page:
if(!$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, we need to Remove it to add new page number information.
//Regular expressions are used here, please refer to "Regular Expressions in PHP"
$url_query=ereg_replace("(^|&)page=$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:
$pagenav="Display the first -".min($firstcount+$displaypg,$totle)." records, Total $totle records";

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

$pagenav.=" < a href='$url=1'>Homepage ";
if($prepg) $pagenav.=" Previous page< /a> "; 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:
$pagenav.=" Go to n";
for($i=1;$i<=$lastpg;$i++){
if($i==$page) $pagenav.="$in";
else $pagenav.="$in";
}
$pagenav.=" page of $lastpg";
}
}
?>


/*
//(The previous procedure is omitted)

include("pageft.php"); //Include the "pageft.php" file
//Get the total number of information
$result=mysql_query( "select * from mytable");
$total=mysql_num_rows($result);
//Call pageft() 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).
pageft($total,10);
//The global variables generated now come in handy:
$result=mysql_query("select * from mytable limit $firstcount,$displaypg ");
while($row=mysql_fetch_array($result)){
//(list content omitted)
}

//Output paging navigation bar code:
echo $pagenav;

//(The following procedures are omitted)
*/
?>

http://www.bkjia.com/PHPjc/320072.htmlwww.bkjia.comtruehttp: //www.bkjia.com/PHPjc/320072.htmlTechArticleCopy the code as follows: ?php /* * Created on 2007-6-8 * Programmer: Alan , Msn - haowubai@hotmail.com * PHP100.com Develop a project PHP - MySQL - Apache * Window - Preferences...