February 12, 2011 
Definition:
function get_post_custom_values( $key = '', $post_id = 0 ) {}
Retrieve values for a custom post field.
The parameters must not be considered optional. All of the post meta fields will be retrieved and only the meta field key values returned.
Parameters
- string $key: Meta field key.
- int $post_id: Post ID
Return values
returns:Meta field values.
Source code
function get_post_custom_values( $key = '', $post_id = 0 ) {
if ( !$key )
return null;
$custom = get_post_custom($post_id);
return isset($custom[$key]) ? $custom[$key] : null;
}
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A HitchHackers guide through WordPress 
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