February 12, 2011 
Definition:
function get_post_custom_keys( $post_id = 0 ) {}
Retrieve meta field names for a post.
If there are no meta fields, then nothing (null) will be returned.
Parameters
- int $post_id: post ID
Return values
returns:Either array of the keys, or null if keys could not be retrieved.
Source code
function get_post_custom_keys( $post_id = 0 ) {
$custom = get_post_custom( $post_id );
if ( !is_array($custom) )
return;
if ( $keys = array_keys($custom) )
return $keys;
}
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A HitchHackers guide through WordPress 
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