问题
I'm new to rss feeds and php pagination. I'm trying to parse rss feed and display each feed details on separate pages. I copied and pasted the pagination code from http://www.phpeasystep.com/phptu/29.html. When i run index.php on localhost, nothing gets displayed.
I have no problem downloading the rss feed using curl. I have also tried print_r($data) and data is displaying fine.
Can someone point me on where i'm going wrong? thank you.
my code:
<?php
if (function_exists("curl_init")){
$ch=curl_init();
curl_setopt($ch,CURLOPT_URL,"http://feeds.feedburner.com/rb286");
curl_setopt($ch,CURLOPT_RETURNTRANSFER,1);
$data=curl_exec($ch);
curl_close($ch);
$doc=new SimpleXmlElement($data);
//print_r($doc);
}
function parseRSS($xml){
$items=$xml->xPath('/rss/channels/item');
$count=count($items);
// How many adjacent pages should be shown on each side?
$adjacents =3;
$total_pages = $count;
/* Setup vars for query. */
$targetpage = "index.php"; //your file name (the name of this file)
$limit = 1; //how many items to show per page
$page = $_GET['page'];
if($page)
$start = ($page - 1) * $limit; //first item to display on this page
else
$start = 0; //if no page var is given, set start to 0
/* Setup page vars for display. */
if ($page == 0) $page = 1; //if no page var is given, default to 1.
$prev = $page - 1; //previous page is page - 1
$next = $page + 1; //next page is page + 1
$lastpage = ceil($total_pages/$limit); //lastpage is = total pages / items per page, rounded up.
$lpm1 = $lastpage - 1; //last page minus 1
/*
Now we apply our rules and draw the pagination object.
We're actually saving the code to a variable in case we want to draw it more than once.
*/
$pagination = "";
if($lastpage > 1)
{
$pagination .= "<div class=\"pagination\">";
//previous button
if ($page > 1)
$pagination.= "<a href=\"$targetpage?page=$prev\">� previous</a>";
else
$pagination.= "<span class=\"disabled\">� previous</span>";
//pages
if ($lastpage < 7 + ($adjacents * 2)) //not enough pages to bother breaking it up
{
for ($counter = 1; $counter <= $lastpage; $counter++)
{
if ($counter == $page)
$pagination.= "<span class=\"current\">$counter</span>";
else
$pagination.= "<a href=\"$targetpage?page=$counter\">$counter</a>";
}
}
elseif($lastpage > 5 + ($adjacents * 2)) //enough pages to hide some
{
//close to beginning; only hide later pages
if($page < 1 + ($adjacents * 2))
{
for ($counter = 1; $counter < 4 + ($adjacents * 2); $counter++)
{
if ($counter == $page)
$pagination.= "<span class=\"current\">$counter</span>";
else
$pagination.= "<a href=\"$targetpage?page=$counter\">$counter</a>";
}
$pagination.= "...";
$pagination.= "<a href=\"$targetpage?page=$lpm1\">$lpm1</a>";
$pagination.= "<a href=\"$targetpage?page=$lastpage\">$lastpage</a>";
}
//in middle; hide some front and some back
elseif($lastpage - ($adjacents * 2) > $page && $page > ($adjacents * 2))
{
$pagination.= "<a href=\"$targetpage?page=1\">1</a>";
$pagination.= "<a href=\"$targetpage?page=2\">2</a>";
$pagination.= "...";
for ($counter = $page - $adjacents; $counter <= $page + $adjacents; $counter++)
{
if ($counter == $page)
$pagination.= "<span class=\"current\">$counter</span>";
else
$pagination.= "<a href=\"$targetpage?page=$counter\">$counter</a>";
}
$pagination.= "...";
$pagination.= "<a href=\"$targetpage?page=$lpm1\">$lpm1</a>";
$pagination.= "<a href=\"$targetpage?page=$lastpage\">$lastpage</a>";
}
//close to end; only hide early pages
else
{
$pagination.= "<a href=\"$targetpage?page=1\">1</a>";
$pagination.= "<a href=\"$targetpage?page=2\">2</a>";
$pagination.= "...";
for ($counter = $lastpage - (2 + ($adjacents * 2)); $counter <= $lastpage; $counter++)
{
if ($counter == $page)
$pagination.= "<span class=\"current\">$counter</span>";
else
$pagination.= "<a href=\"$targetpage?page=$counter\">$counter</a>";
}
}
}
//next button
if ($page < $counter - 1)
$pagination.= "<a href=\"$targetpage?page=$next\">next �</a>";
else
$pagination.= "<span class=\"disabled\">next �</span>";
$pagination.= "</div>\n";
}
foreach($items as $item){
echo("<a href='".$item[0]->link."'>".$item[0]->title."</a>");
}
}
if (isset($doc->channel))parseRSS($doc);
?>
<?php
echo($pagination);
?>
</body>
回答1:
Okay, so there are some issues with this code :
First the variable $pagination; is created within the function and therefor not available outside in the global scope. the quick fix for this is :
At the beginning of the page add :
<?php
$pagination = '';
Inside the function add :
function parseRSS($xml){
global $pagination;
Next the Xpath location is wrong
change :
$items=$xml->xPath('/rss/channels/item');
into
$items=$xml->xPath('/rss/channel/item');
These changes should give you some output to get started, i think there are more issues with your pagination but you should manage to sort it out once you have some output.
EDIT : To get only the needed link you should change :
<?php
foreach($items as $item){
echo("<a href='".$item[0]->link."'>".$item[0]->title."</a>");
}
into :
<?php
foreach($items as $key => $item){
if( ( $key >= $start) && ($key < $start + $limit) ){
echo("<a href='".$item[0]->link."'>".$item[0]->title."</a>");
}
}
回答2:
DonSeba, your 2nd foreach loop works fine. Each link is displaying well on a different page. However, can you please tell me what is the purpose of your if statement with 2 conditions? I tried out the following with only 1 if condition and it works fine too:
foreach($items as $key => $item){
//if( ( $key >= $start) && ($key < $start + $limit) ){ //your if statement
if ($key==$start){
echo("<a href='".$item[0]->link."'>".$item[0]->title."</a>");
}
}
thank you.
来源：https://stackoverflow.com/questions/11574231/displaying-rss-feed-with-php-pagination