is_numeric() tjekker om $_GET["visfra"] er et tal.
Så kan du ikke bruge en streng.
Bruger selv dette:
<?php
function make_link($getvar, $tx, $filnavn="", $class="") {
if(empty($filnavn)) {
$filename = $_SERVER["PHP_SELF"];
}else{
$filename = $filnavn;
}
return "<a href=\"". $filename . $getvar ."\" class=\"". $class ."\">". htmlentities($tx) ."</a>";
}
function make_sublinks($antalviste, $ialt, $getvar, $qstring="") {
if($ialt > $antalviste) {
if(isset($_GET[$getvar]) && $_GET[$getvar] >= $ialt) {
return;
}
if(!empty($qstring)) {
$qlink = $qstring ."&". $getvar ."=";
}else{
$qlink = "?". $getvar ."=";
}
if(!isset($_GET[$getvar]) || !is_numeric($_GET[$getvar]) || $_GET[$getvar] < 0) {
$back = " ";
$next = make_link($qlink . $antalviste, "næste") ." ". make_link($qlink . ($ialt-$antalviste), ">>");
$info = "1 - ". $antalviste ." af ". $ialt;
}else{
$info = ($_GET[$getvar]+1) ." - ". ($_GET[$getvar]+$antalviste) ." af ". $ialt;
if($_GET[$getvar] <= $antalviste) {
$linket = $qstring;
}elseif($_GET[$getvar] >= $ialt) {
$linket = $qlink . ($ialt-$antalviste);
}else{
$linket = $qlink . ($_GET[$getvar]-$antalviste);
}
$back = make_link($qstring, "<<") ." ". make_link($linket, "forrige");
if(($_GET[$getvar]+$antalviste) >= $ialt) {
$next = " ";
$info = ($_GET[$getvar]+1) ." - ". $ialt ." af ". $ialt;
}else{
$next = make_link($qlink . ($_GET[$getvar]+$antalviste), "næste");
if($_GET[$getvar] < ($ialt-$antalviste)) {
$next = $next ." ". make_link($qlink . ($ialt-$antalviste), ">>");
}
}
}
echo"<table width=\"400\" border=\"0\" align=\"center\"><tr>\n";
echo" <td width=\"33%\" class=\"small\">". $back ."</td>\n";
echo" <td width=\"34%\" class=\"small\" align=\"center\">". $info ."</td>\n";
echo" <td width=\"33%\" class=\"small\" align=\"right\">". $next ."</td>\n";
echo"</tr></table>";
}
}
make_sublinks(5, 43, "vis");
?>
