February 12, 2011 
Definition:
function get_posts($args = null) {}
Retrieve list of latest posts or posts matching criteria.
The defaults are as follows: ‘numberposts’ – Default is 5. Total number of posts to retrieve. ‘offset’ – Default is 0. See WP_Query::query() for more. ‘category’ – What category to pull the posts from. ‘orderby’ – Default is ‘post_date’. How to order the posts. ‘order’ – Default is ‘DESC’. The order to retrieve the posts. ‘include’ – See WP_Query::query() for more. ‘exclude’ – See WP_Query::query() for more. ‘meta_key’ – See WP_Query::query() for more. ‘meta_value’ – See WP_Query::query() for more. ‘post_type’ – Default is ‘post’. Can be ‘page’, or ‘attachment’ to name a few. ‘post_parent’ – The parent of the post or post type. ‘post_status’ – Default is ‘publish’. Post status to retrieve.
Parameters
- array $args: Optional. Overrides defaults.
Return values
returns:List of posts.
Source code
function get_posts($args = null) {
$defaults = array(
'numberposts' => 5, 'offset' => 0,
'category' => 0, 'orderby' => 'post_date',
'order' => 'DESC', 'include' => array(),
'exclude' => array(), 'meta_key' => '',
'meta_value' =>'', 'post_type' => 'post',
'suppress_filters' => true
);
$r = wp_parse_args( $args, $defaults );
if ( empty( $r['post_status'] ) )
$r['post_status'] = ( 'attachment' == $r['post_type'] ) ? 'inherit' : 'publish';
if ( ! empty($r['numberposts']) && empty($r['posts_per_page']) )
$r['posts_per_page'] = $r['numberposts'];
if ( ! empty($r['category']) )
$r['cat'] = $r['category'];
if ( ! empty($r['include']) ) {
$incposts = wp_parse_id_list( $r['include'] );
$r['posts_per_page'] = count($incposts); // only the number of posts included
$r['post__in'] = $incposts;
} elseif ( ! empty($r['exclude']) )
$r['post__not_in'] = wp_parse_id_list( $r['exclude'] );
$r['ignore_sticky_posts'] = true;
$r['no_found_rows'] = true;
$get_posts = new WP_Query;
return $get_posts->query($r);
}
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A HitchHackers guide through WordPress 
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