February 12, 2011 
Definition:
function wp_get_attachment_metadata( $post_id = 0, $unfiltered = false ) {}
Retrieve attachment meta field for attachment ID.
Parameters
- int $post_id: Attachment ID
- bool $unfiltered: Optional, default is false. If true, filters are not run.
Return values
returns:Attachment meta field. False on failure.
Defined filters
- wp_get_attachment_metadata
apply_filters( 'wp_get_attachment_metadata', $data, $post->ID )
Source code
function wp_get_attachment_metadata( $post_id = 0, $unfiltered = false ) {
$post_id = (int) $post_id;
if ( !$post =& get_post( $post_id ) )
return false;
$data = get_post_meta( $post->ID, '_wp_attachment_metadata', true );
if ( $unfiltered )
return $data;
return apply_filters( 'wp_get_attachment_metadata', $data, $post->ID );
}
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A HitchHackers guide through WordPress 
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