Retrieve values for a custom post field.

what are you trying to do actually?

this is what you want

[ Moderator note: please wrap code in backticks or use the code button. ]

add_filter('sf_post', 'sf_replace_custom_values', 1, 10);
function sf_replace_custom_values($post) {
    $cvalue = get_post_custom_values('KEY', $post->ID);
    if(sizeof($cvalue) > 0){
         $post->post_cvalue = $cvalue;
    }else{
         $post->post_cvalue = '';
    }
    return $post;
}

replace KEY with your custom key field name, and insert {post_cvalue} in your template where you want the custom field value to appear.

you can improve this function more if you are looking for only specific post type, Contact me for details on such development

what do you mean by category?, categories doesn’t have custom values

please give me more details

add_filter('sf_post', 'sf_replace_custom_values', 1, 10);
function sf_replace_custom_values($post) {
$cvalue = get_post_custom_values('KEY', $post->ID);
if(sizeof($cvalue) > 0){
$post->post_cvalue = $cvalue;
}else{
$post->post_cvalue = '';
}
$b = array();
$categories = get_the_category($post->ID);
if($categories){
foreach($categories as $category){
$b[] = $category->cat_name;
}
}
$post->categories = implode(', ', $b);
return $post;
}

add {categories} to the template, should show a list of comma separated category names