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get or query posts by terms of taxonomy

飞龙更新于 2011-02-17 06:51 加入书签 CTRL+D 有 252 个朋友来过

How to get posts by terms of taxonomy ?For eaxmple,feilong want to get posts with the term slug 'zhangye'or 'linzhiying' in the taxonomy 'singer' ,Here is three ways http://feilong.org/get-or-query-posts-by-terms-of-taxonomy

<?php
/**One way, new WP_Query() to get posts by certain taxonomy slug or post type **/
$args=array(
'post_type'=>'post',
'orderby'=>'count',
'posts_per_page'=>-1,
'singer'=> 'zhangye' //certain slug
);
$flposts = new WP_Query();
$flposts->query($args);
while ($flposts->have_posts()) : $flposts->the_post();
$postid=$post->ID;echo 'Post id is '.$postid;
the_title();
//the_category(', ');the_permalink();
//other stuff
endwhile;
 
//end of query posts by certain taxonomy term using WP_Query
//Feilong: Perhaps you try query posts(),or get_posts() instead ?
?>
<?php
// Two,in functions.php.
// refer to: wordpress.org/support/topic/query-posts-by-taxonomy
/*-------------------------------------------------------------------
Get Posts by a Taxonomy Terms
by Benji Greig benjibuls@gmail.com
-------------------------------------------------------------------
This function allows for a query to be made similar to get_posts but
allows for filtering by 'taxonomy_name' and multiple taxonomy terms.
 
You can filter the query by comma delimited lists of:
- 'taxonomy_terms'
- 'post_types'
 
Additionally you can filter the query by 'post_status' and define
the 'orderby' from any of the posts fields and set either ascending
or decending. It's not perfect, but it's coming in real handy for
making special queries.
-------------------------------------------------------------------*/
function get_posts_by_taxonomy($args) {
global $wpdb;
//
if ( is_array($args) )
$options = &$args;
else
parse_str($args, $options);
//
$defaults = array(
'post_type' => null,
'post_status' => 'publish',
'taxonomy_name' => null,
'taxonomy_term' => null,
'orderby' => 'post_date',
'order' => 'DESC',
'numberposts' => '10'
);
$options = array_merge($defaults, $options);
extract($options);
//
//Format the post_type list so that it works in the query
$post_type = "('".str_replace(",","', '",$options['post_type'])."')";
//
//Get the term IDs from the Term Names
$terms = split('[,]', $options['taxonomy_term']);
$term_ids = $options['taxonomy_term'];
foreach($terms as $term){
$t_data = term_exists($term, $taxonomy_name);
$term_ids = str_replace($term,"'".$t_data['term_id']."'",$term_ids);
}
$term_ids = "(".$term_ids.")";
//
//Build the query
$query = "SELECT $wpdb->posts.* FROM $wpdb->posts
INNER JOIN $wpdb->term_relationships ON ($wpdb->posts.ID = $wpdb->term_relationships.object_id)
INNER JOIN $wpdb->term_taxonomy ON ($wpdb->term_relationships.term_taxonomy_id = $wpdb->term_taxonomy.term_taxonomy_id)
WHERE 1=1
";
if($options['taxonomy_name'] != null){$query .="AND $wpdb->term_taxonomy.taxonomy = '".$options['taxonomy_name']."'
";
if($options['taxonomy_term'] != null){$query .="AND $wpdb->term_taxonomy.term_id IN $term_ids
";}
}
if($options['post_type'] != null){$query .="AND $wpdb->posts.post_type IN $post_type
";}
$query .="AND $wpdb->posts.post_status = '".$options['post_status']."'
";
$query .="GROUP BY $wpdb->posts.ID
";
$query .="ORDER BY $wpdb->posts.".$options['orderby']." ".$options['order'];
 
$my_posts = $wpdb->get_results($query);
return($my_posts);
}
 
//An example of using get_posts_by_taxonomy() within a loop:
$args = array(
'post_status' => 'publish',
'taxonomy_name' => 'singer',
'taxonomy_term' => 'zhangye, linzhiying'//Feilong: string,not array!
);$custom_posts = get_posts_by_taxonomy($args);
if ($custom_posts):
foreach ($custom_posts as $post): setup_postdata($post);
the_title();
//the_category(', ');the_permalink();
//other stuff
endforeach; else : endif;
 
//end of get posts by Taxonomy terms
?>
<?php
/** Three, if you are using wp3.1 or above,Perhaps you can query posts by taxonomy terms?*/
// Feilong: available with Version 3.1
$args=array(
'post_type'=>'post',
'orderby'=>'count',//or name
'posts_per_page'=>-1,
'tax_query' => array(
array('taxonomy' =>'singer','field' =>'slug','terms' => array('zhengye','linzhiling') )
)
);
query_posts($args);//refer to codex.wordpress.org/Template_Tags/query_posts#Taxonomy_Parameters
if(have_posts) : while(have_posts()) : the_post();
$postid=$post->ID;echo 'Post id is '.$postid;
the_title();
//the_category(', ');the_permalink();
//other stuff
endwhile;else:endif;
//end of query posts by Taxonomy Parameters,available with Version 3.1
?>

飞龙初发:
2011-02-17 06:51
本文更新网址:
https://feilong.org/get-or-query-posts-by-terms-of-taxonomy

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