PHP+Mysql分頁

<?php$conn = mysql_connect ( "localhost", "root", "root" );mysql_select_db ( "test", $conn );mysql_query ( "set names 'UTF-8'" );$showNum = 4;if ($_GET ['goPageNum']) {    $goPageNum = $_GET ['goPageNum'];    if ($goPageNum <= 0)        $goPageNum = 1;} else {    $goPageNum = 1;}$nowShowBeginNum = ($goPageNum - 1) * $showNum; // 索引0算第一條資料$sel_message = "select * from message limit $nowShowBeginNum,$showNum";$que_message = mysql_query ( $sel_message ) or die ( "Invalid query: " . mysql_error () );?><form action="" method="get">    <a href="?goPageNum=<?php echo ($goPageNum -1);?>">上一頁</a> ：<a href="?goPageNum=<?php echo ($goPageNum +1);?>">下一頁</a><br/><?phpwhile ( $row_message = mysql_fetch_array ( $que_message ) ) {    echo $row_message ['id'] . " : " . $row_message ['title'] . " : " . $row_message ['content'] . "<br>";}?></form>