Simple and easy-to-understand modern magic animation. PHP introductory learning knowledge point 2. PHP simple paging process and principle

require '../inc/conn.php';
?>
//Initial parameter settings
$pagesize=5; //Page size
$pagenum=1; // The default is the first page
//Step 1: Get the current page
if($_GET){
if($_GET['pagenum']){
$pagenum=$_GET['pagenum'];
}
}
//Step 2: Get the content list of the current page
$sql="Select * From message limit ".($pagenum-1)*$pagesize.",$pagesize ";
$result=mysql_query( $sql);
while(($row=mysql_fetch_array($result))==true){
echo '

---

'.$row["title"].'';
}
//Step 3: Get the number of records
$sql="Select id From message";
$result=mysql_query($sql);
$rownum=mysql_num_rows($result);
//Step 4: Calculate the score Number of pages
if(($rownum%$pagesize)==0){
$pagecount=$rownum/$pagesize;
}else{
$pagecount=(int)($rownum/$pagesize);
}
/ /Step 5: Get the paging link
$url=$_SERVER["REQUEST_URI"];
$url=parse_url($url);
$url=$url["path"];
//Step 6: Output Pagination link
if($pagenum==1){
echo "[First page] [Previous page]";
}else{
echo "[ First page] [Previous page]";
}
if( $pagecount==$pagenum){
echo "[next page] [last page]";
}else{
echo "[Next page] [Last page]";
}
?>

The above introduces the simple and easy-to-understand modern magic animation PHP entry-level learning knowledge point 2. The simple paging process and principles of PHP, including the simple and easy-to-understand content of modern magic animation. I hope it will be helpful to friends who are interested in PHP tutorials.