Blättern in Kategorien

<?php
/*
Plugin Name: Next/Previous Post in same Category
Version: v 0.2
Plugin URI: http://www.scriptygoddess.com/archives/2004/07/24/nextprevious-posts-in-same-category/
Description: This plugin will give you two functions that will give you links to the next/previous post in the same category as the current post.
Author: Jennifer - Scriptygoddess
Author URI: http://scriptygoddess.com


supports up2date plugin
http://software.vtpaintball.net/wordpress/up2date.php


*/


/*
up2date support
*/
if( function_exists( 'u2d_register_plugin' ) ) {
        u2d_register_plugin( "Next/Previous Post in same Category", "http://www.scriptygoddess.com/up2date/nextPreviousCatCurrent.txt", "0.2", 3);
}




function previous_cat_post($beforeGroup='<ul>', $afterGroup='</ul>', $beforeEach='<li>', $afterEach='</li>', $showtitle=true, $textForEach='Previous post in %:<br />') {
    global $wpdb, $tableposts, $tablepost2cat, $tablecategories, $post;
    
    if (!isset($tableposts))
        $tableposts = $wpdb->posts;
    if (!isset($tablepost2cat))
        $tablepost2cat = $wpdb->post2cat;
    if (!isset($tablecategories))
        $tablecategories = $wpdb->categories;        
    
    //get home url for base of link    
    $info = get_bloginfo('url');
    $info = apply_filters('bloginfo', $info);
    $homeurl = convert_chars($info);
    
    //get post id of current post
    $currentPostId = $post->ID;
    //get cat id of current post
    $currentCatIds = $wpdb->get_results("SELECT category_id FROM $tablepost2cat WHERE post_id = $currentPostId");
    
    $startGroup = true;
    
    foreach ($currentCatIds as $currentCatId) {
        //get post id of previous post
        $previousPostId = $wpdb->get_var("SELECT post_id from $tablepost2cat, $tableposts WHERE category_id = $currentCatId->category_id AND post_id < $currentPostId AND post_status = 'publish' AND post_id = ID ORDER BY post_id DESC LIMIT 1");


        if ($previousPostId) {
            $previousPostInfo = $wpdb->get_row("SELECT * FROM $tableposts WHERE ID = $previousPostId");
            
            $previousCatInfo = $wpdb->get_row("SELECT cat_name FROM $tablecategories WHERE cat_ID = $currentCatId->category_id");
            
            $leaderText = str_replace('%', $previousCatInfo->cat_name, $textForEach);
            
            if ($startGroup) {
                echo $beforeGroup;
                $startGroup = false;
            }
            
            if ($showtitle) {
                echo $beforeEach.$leaderText."<a href=\"".get_permalink($previousPostId)."\">".stripslashes($previousPostInfo->post_title)."</a>".$afterEach;
            } else {
                echo $beforeEach."<a href=\"".get_permalink($previousPostId)."\">".$leaderText."</a>".$afterEach;
            }
        }
    }
    if (!$startGroup) {
        echo $afterGroup;
    }
}


function next_cat_post($beforeGroup='<ul>', $afterGroup='</ul>', $beforeEach='<li>', $afterEach='</li>', $showtitle=true, $textForEach='Next post in %:<br />') {
    global $wpdb, $tableposts, $tablepost2cat, $tablecategories, $post;
    
    if (!isset($tableposts))
        $tableposts = $wpdb->posts;
    if (!isset($tablepost2cat))
        $tablepost2cat = $wpdb->post2cat;
    if (!isset($tablecategories))
        $tablecategories = $wpdb->categories;        
    
    //get home url for base of link    
    $info = get_bloginfo('url');
    $info = apply_filters('bloginfo', $info);
    $homeurl = convert_chars($info);
    
    //get post id of current post
    $currentPostId = $post->ID;
    //get cat id of current post
    $currentCatIds = $wpdb->get_results("SELECT category_id FROM $tablepost2cat WHERE post_id = $currentPostId");
    
    $startGroup = true;
    
    foreach ($currentCatIds as $currentCatId) {
        //get post id of next post
        $nextPostId = $wpdb->get_var("SELECT post_id from $tablepost2cat, $tableposts WHERE category_id = $currentCatId->category_id AND post_id > $currentPostId AND post_status = 'publish' AND post_id = ID ORDER BY post_id ASC LIMIT 1");
        
        if ($nextPostId) {
            $nextPostInfo = $wpdb->get_row("SELECT * FROM $tableposts WHERE ID = $nextPostId");
            
            $nextCatInfo = $wpdb->get_row("SELECT cat_name FROM $tablecategories WHERE cat_ID = $currentCatId->category_id");
            
            $leaderText = str_replace('%', $nextCatInfo->cat_name, $textForEach);
            
            if ($startGroup) {
                echo $beforeGroup;
                $startGroup = false;
            }
            
            if ($showtitle) {
                echo $beforeEach.$leaderText."<a href=\"".get_permalink($nextPostId)."\">".stripslashes($nextPostInfo->post_title)."</a>".$afterEach;
            } else {
                echo $beforeEach."<a href=\"".get_permalink($nextPostId)."\">".$leaderText."</a>".$afterEach;
            }
        }
    }
    if (!$startGroup) {
        echo $afterGroup;
    }
}
?>