get_post_custom($postid);

 if (have_posts()) :
 
 while (have_posts()) : the_post(); 
  var_dump(get_post_custom());
 
 endwhile; 
 
 endif;

array(4) {
[“_edit_last”]=>
array(1) {
[0]=>
string(1) “1”
}
[“_edit_lock”]=>
array(1) {
[0]=>
string(12) “1342451729:1”
}
[“_thumbnail_id”]=>
array(1) {
[0]=>
string(3) “228”
}
[“xzmeta”]=>
array(2) {
[0]=>
string(3) “xz1”
[1]=>
string(3) “xz2”
}
}

 while (have_posts()) : the_post(); 
  var_dump(get_post_custom_values(‘xzmeta'));
 endwhile; 
 
 endif;

array(2) {
[0]=>
string(3) “xz1”
[1]=>
string(3) “xz2”
}

 if (have_posts()) :
 while (have_posts()) : the_post(); 
  var_dump(get_post_custom_keys());
 endwhile; 
 endif;

array(4) {
[0]=>
string(10) “_edit_last”
[1]=>
string(10) “_edit_lock”
[2]=>
string(13) “_thumbnail_id”
[3]=>
string(6) “xzmeta”
}