This should do the trick. Put the following code in your functions.php and then check out the RSS Widget. It will have an option to reverse the order of the feeds.
/**
* RSS widget class
*/
class Reverse_Widget_RSS extends WP_Widget {
function __construct() {
$widget_ops = array( 'description' => __('Entries from any RSS or Atom feed ( with Reverse Order Option )') );
$control_ops = array( 'width' => 400, 'height' => 200 );
parent::__construct( 'rss', __('RSS'), $widget_ops, $control_ops );
}
function widget($args, $instance) {
if ( isset($instance['error']) && $instance['error'] )
return;
extract($args, EXTR_SKIP);
$url = $instance['url'];
while ( stristr($url, 'http') != $url )
$url = substr($url, 1);
if ( empty($url) )
return;
// self-url destruction sequence
if ( in_array( untrailingslashit( $url ), array( site_url(), home_url() ) ) )
return;
$rss = fetch_feed($url);
$title = $instance['title'];
$desc="";
$link = '';
if ( ! is_wp_error($rss) ) {
$desc = esc_attr(strip_tags(@html_entity_decode($rss->get_description(), ENT_QUOTES, get_option('blog_charset'))));
if ( empty($title) )
$title = esc_html(strip_tags($rss->get_title()));
$link = esc_url(strip_tags($rss->get_permalink()));
while ( stristr($link, 'http') != $link )
$link = substr($link, 1);
}
if ( empty($title) )
$title = empty($desc) ? __('Unknown Feed') : $desc;
$title = apply_filters('widget_title', $title, $instance, $this->id_base);
$url = esc_url(strip_tags($url));
$icon = includes_url('images/rss.png');
if ( $title )
$title = "<a class="rsswidget" href="https://wordpress.stackexchange.com/questions/33545/$url" title="" . esc_attr__( "Syndicate this content' ) ."'><img style="border:0" width="14" height="14" src="$icon" alt="RSS" /></a> <a class="rsswidget" href="$link" title="$desc">$title</a>";
echo $before_widget;
if ( $title )
echo $before_title . $title . $after_title;
reverse_widget_rss_output( $rss, $instance );
echo $after_widget;
if ( ! is_wp_error($rss) )
$rss->__destruct();
unset($rss);
}
function update($new_instance, $old_instance) {
$testurl = ( isset($new_instance['url']) && ($new_instance['url'] != $old_instance['url']) );
return reverse_widget_rss_process( $new_instance, $testurl );
}
function form($instance) {
if ( empty($instance) )
$instance = array( 'title' => '', 'url' => '', 'items' => 10, 'error' => false, 'show_summary' => 0, 'show_author' => 0, 'show_date' => 0, 'reverse' => 0 );
$instance['number'] = $this->number;
reverse_widget_rss_form( $instance );
}
}
function reverse_widget_rss_output( $rss, $args = array() ) {
if ( is_string( $rss ) ) {
$rss = fetch_feed($rss);
} elseif ( is_array($rss) && isset($rss['url']) ) {
$args = $rss;
$rss = fetch_feed($rss['url']);
} elseif ( !is_object($rss) ) {
return;
}
if ( is_wp_error($rss) ) {
if ( is_admin() || current_user_can('manage_options') )
echo '<p>' . sprintf( __('<strong>RSS Error</strong>: %s'), $rss->get_error_message() ) . '</p>';
return;
}
$default_args = array( 'show_author' => 0, 'show_date' => 0, 'show_summary' => 0, 'reverse' => 0 );
$args = wp_parse_args( $args, $default_args );
extract( $args, EXTR_SKIP );
$items = (int) $items;
if ( $items < 1 || 20 < $items )
$items = 10;
$show_summary = (int) $show_summary;
$show_author = (int) $show_author;
$show_date = (int) $show_date;
$reverse = (int) $reverse;
if ( !$rss->get_item_quantity() ) {
echo '<ul><li>' . __( 'An error has occurred; the feed is probably down. Try again later.' ) . '</li></ul>';
$rss->__destruct();
unset($rss);
return;
}
if( $reverse )
$feed_items = array_reverse( $rss->get_items(0, $items) );
else
$feed_items = $rss->get_items(0, $items);
echo '<ul>';
foreach ( $feed_items as $item ) {
$link = $item->get_link();
while ( stristr($link, 'http') != $link )
$link = substr($link, 1);
$link = esc_url(strip_tags($link));
$title = esc_attr(strip_tags($item->get_title()));
if ( empty($title) )
$title = __('Untitled');
$desc = str_replace( array("\n", "\r"), ' ', esc_attr( strip_tags( @html_entity_decode( $item->get_description(), ENT_QUOTES, get_option('blog_charset') ) ) ) );
$desc = wp_html_excerpt( $desc, 360 );
// Append ellipsis. Change existing [...] to […].
if ( '[...]' == substr( $desc, -5 ) )
$desc = substr( $desc, 0, -5 ) . '[…]';
elseif ( '[…]' != substr( $desc, -10 ) )
$desc .= ' […]';
$desc = esc_html( $desc );
if ( $show_summary ) {
$summary = "<div class="rssSummary">$desc</div>";
} else {
$summary = '';
}
$date="";
if ( $show_date ) {
$date = $item->get_date( 'U' );
if ( $date ) {
$date=" <span class="rss-date">" . date_i18n( get_option( 'date_format' ), $date ) . '</span>';
}
}
$author="";
if ( $show_author ) {
$author = $item->get_author();
if ( is_object($author) ) {
$author = $author->get_name();
$author=" <cite>" . esc_html( strip_tags( $author ) ) . '</cite>';
}
}
if ( $link == '' ) {
echo "<li>$title{$date}{$summary}{$author}</li>";
} else {
echo "<li><a class="rsswidget" href="$link" title="$desc">$title</a>{$date}{$summary}{$author}</li>";
}
}
echo '</ul>';
$rss->__destruct();
unset($rss);
}
function reverse_widget_rss_process( $widget_rss, $check_feed = true ) {
$items = (int) $widget_rss['items'];
if ( $items < 1 || 20 < $items )
$items = 10;
$url = esc_url_raw(strip_tags( $widget_rss['url'] ));
$title = trim(strip_tags( $widget_rss['title'] ));
$show_summary = isset($widget_rss['show_summary']) ? (int) $widget_rss['show_summary'] : 0;
$show_author = isset($widget_rss['show_author']) ? (int) $widget_rss['show_author'] :0;
$show_date = isset($widget_rss['show_date']) ? (int) $widget_rss['show_date'] : 0;
$reverse = isset($widget_rss['reverse']) ? (int) $widget_rss['reverse'] : 0;
if ( $check_feed ) {
$rss = fetch_feed($url);
$error = false;
$link = '';
if ( is_wp_error($rss) ) {
$error = $rss->get_error_message();
} else {
$link = esc_url(strip_tags($rss->get_permalink()));
while ( stristr($link, 'http') != $link )
$link = substr($link, 1);
$rss->__destruct();
unset($rss);
}
}
return compact( 'title', 'url', 'link', 'items', 'error', 'show_summary', 'show_author', 'show_date', 'reverse' );
}
function reverse_widget_rss_form( $args, $inputs = null ) {
$default_inputs = array( 'url' => true, 'title' => true, 'items' => true, 'show_summary' => true, 'show_author' => true, 'show_date' => true, 'reverse' => true );
$inputs = wp_parse_args( $inputs, $default_inputs );
extract( $args );
extract( $inputs, EXTR_SKIP);
$number = esc_attr( $number );
$title = esc_attr( $title );
$url = esc_url( $url );
$items = (int) $items;
if ( $items < 1 || 20 < $items )
$items = 10;
$show_summary = (int) $show_summary;
$show_author = (int) $show_author;
$show_date = (int) $show_date;
$reverse = (int) $reverse;
if ( !empty($error) )
echo '<p class="widget-error"><strong>' . sprintf( __('RSS Error: %s'), $error) . '</strong></p>';
if ( $inputs['url'] ) :
?>
<p><label for="rss-url-<?php echo $number; ?>"><?php _e('Enter the RSS feed URL here:'); ?></label>
<input class="widefat" id="rss-url-<?php echo $number; ?>" name="widget-rss[<?php echo $number; ?>][url]" type="text" value="<?php echo $url; ?>" /></p>
<?php endif; if ( $inputs['title'] ) : ?>
<p><label for="rss-title-<?php echo $number; ?>"><?php _e('Give the feed a title (optional):'); ?></label>
<input class="widefat" id="rss-title-<?php echo $number; ?>" name="widget-rss[<?php echo $number; ?>]How to reorder and display a feed to be chronological?" type="text" value="<?php echo $title; ?>" /></p>
<?php endif; if ( $inputs['items'] ) : ?>
<p><label for="rss-items-<?php echo $number; ?>"><?php _e('How many items would you like to display?'); ?></label>
<select id="rss-items-<?php echo $number; ?>" name="widget-rss[<?php echo $number; ?>][items]">
<?php
for ( $i = 1; $i <= 20; ++$i )
echo "<option value="$i" " . ( $items == $i ? "selected='selected'" : '' ) . ">$i</option>";
?>
</select></p>
<?php endif; if ( $inputs['show_summary'] ) : ?>
<p><input id="rss-show-summary-<?php echo $number; ?>" name="widget-rss[<?php echo $number; ?>][show_summary]" type="checkbox" value="1" <?php if ( $show_summary ) echo 'checked="checked"'; ?>/>
<label for="rss-show-summary-<?php echo $number; ?>"><?php _e('Display item content?'); ?></label></p>
<?php endif; if ( $inputs['show_author'] ) : ?>
<p><input id="rss-show-author-<?php echo $number; ?>" name="widget-rss[<?php echo $number; ?>][show_author]" type="checkbox" value="1" <?php if ( $show_author ) echo 'checked="checked"'; ?>/>
<label for="rss-show-author-<?php echo $number; ?>"><?php _e('Display item author if available?'); ?></label></p>
<?php endif; if ( $inputs['show_date'] ) : ?>
<p><input id="rss-show-date-<?php echo $number; ?>" name="widget-rss[<?php echo $number; ?>][show_date]" type="checkbox" value="1" <?php if ( $show_date ) echo 'checked="checked"'; ?>/>
<label for="rss-show-date-<?php echo $number; ?>"><?php _e('Display item date?'); ?></label></p>
<?php endif; if ( $inputs['reverse'] ) : ?>
<p><input id="rss-reverse-<?php echo $number; ?>" name="widget-rss[<?php echo $number; ?>][reverse]" type="checkbox" value="1" <?php if ( $reverse ) echo 'checked="checked"'; ?>/>
<label for="rss-reverse-<?php echo $number; ?>"><?php _e('Reverse Order?'); ?></label></p>
<?php
endif;
foreach ( array_keys($default_inputs) as $input ) :
if ( 'hidden' === $inputs[$input] ) :
$id = str_replace( '_', '-', $input );
?>
<input type="hidden" id="rss-<?php echo $id; ?>-<?php echo $number; ?>" name="widget-rss[<?php echo $number; ?>][<?php echo $input; ?>]" value="<?php echo $$input; ?>" />
<?php
endif;
endforeach;
}
function register_rss_widget() {
unregister_widget( 'WP_Widget_RSS' );
register_widget( 'Reverse_Widget_RSS' );
}
add_action( 'widgets_init', 'register_rss_widget' );