带有select（选项）框的RSS php阅读器

I create this PHP file. But this read only one link. How can I add the other two? The selection box read on page only one link ... http://www.kurir.rs/rss/vesti/"
http://www.blic.rs/rss/IT

<form action="index.php" method="POST">
    <select name="rss">
        <option value="http://www.kurir.rs/rss/vesti/">Kurir</option>
        <option value="http://www.blic.rs/rss/IT">Blic</option>
        <option value="http://www.b92.net/info/rss/tehnopolis.xml">B92</option>
    </select>
    <input type="submit" value="Select" />
</form>

<?php
$rss = new DOMDocument();
$rss->load('http://www.b92.net/info/rss/tehnopolis.xml');

$feed = array();
foreach ($rss->getElementsByTagName('item') as $node) {
    $item = array ( 
        'title' => $node->getElementsByTagName('title')->item(0)->nodeValue,
        'desc' => $node->getElementsByTagName('description')->item(0)->nodeValue,
        'link' => $node->getElementsByTagName('link')->item(0)->nodeValue,
        'date' => $node->getElementsByTagName('pubDate')->item(0)->nodeValue,
        );
    array_push($feed, $item);
}
$limit = 5;
for($x=0;$x<$limit;$x++) {
    $title = str_replace(' & ', ' &amp; ', $feed[$x]['title']);
    $link = $feed[$x]['link'];
    $description = $feed[$x]['desc'];
    $date = date('l F d, Y', strtotime($feed[$x]['date']));
    echo '<p><strong><a href="'.$link.'" title="'.$title.'">'.$title.'</a></strong><br />';
    echo '<small><em>Posted on '.$date.'</em></small></p>';
    echo '<p>'.$description.'</p>';
}

?>

The simple answer, you need to use what is posted from your form to load the page. So something like this:

$rss_url = isset($_REQUEST['rss']) ? $_REQUEST['rss'] : 'http://www.b92.net/info/rss/tehnopolis.xml';
$rss = new DOMDocument();
$rss->load( $rss_url );

I even threw some validation in there to check if $_REQUEST['rss'] is set.

Is this the best way to do this? no. You would need to further validate your input so people can post something unexpected. Also using POST, may be unnecessary for this. GET might work just fine. But for this exercise, it will work.

Also, if you wanted the option box to show the selected url:

<form action="index.php" method="POST">
    <select name="rss">


<?php
$selection = array (
    'Kurir' => 'http://www.kurir.rs/rss/vesti/', 
    'Blic' => 'http://www.blic.rs/rss/IT', 
    'B92' => 'http://www.b92.net/info/rss/tehnopolis.xml' );

foreach ($selection as $title => $url) {
    if(! empty($_REQUEST) and isset($_REQUEST['rss']) and $_REQUEST['rss'] == $url ){
        $selected = 'selected';       
    } else {
        $selected = '';
    }
    print'<option value="'.$url.'" '.$selected.'>'.$title.'</option>';
    print "
";
}


?>

    </select>
    <input type="submit" value="Select" />
</form>

<?php
$rss_url = isset($_REQUEST['rss']) ? $_REQUEST['rss'] : 'http://www.b92.net/info/rss/tehnopolis.xml';
print $rss_url;