How to get and set image attachment metadata in wordpress?

I have post in WP. This post has attached image as attachment. I set description of this image via dialog (gallery tab) in post edit section.

Now I need WP functions to programmatically get all metadata for this attachment (description,title,caption,...) and another function to set the same da开发者_Go百科ta.

What functions to use ?

use get_children() to retrive atachement for posts.

$args = array(
'numberposts' => -1,
'order'=> 'ASC',
'post_mime_type' => 'image',
'post_parent' => $post->ID,
'post_status' => null,
'post_type' => 'attachment'
);

$attachments = get_children( $args );

a full example here Get URLs, Captions & Titles for Images Attached to Posts in WordPress

This works for me:

<?php
foreach ( $attachments as $attachment_id => $attachment ) {
    $src = wp_get_attachment_image_src( $attachment_id, 'full' );
    var_dump($src);
} ?>


array
  0 => string 'http://example.com/wp-content/uploads/2009/08/DSC00261.JPG' (length=63)
  1 => int 1632
  2 => int 1224
  3 => boolean false

The order of the array is allocated as follows.

$src[0] => url
$src[1] => width
$src[2] => height
$src[3] => icon