February 24, 2011 
Definition:
function set_post_format( $post, $format ) {}
Assign a format to a post
Parameters
- int|object $post: The post for which to assign a format
- string $format: A format to assign. Use an empty string or array to remove all formats from the post.
Return values
returns:WP_Error on error. Array of affected term IDs on success.
Source code
function set_post_format( $post, $format ) {
$post = get_post($post);
if ( empty($post) )
return new WP_Error('invalid_post', __('Invalid post'));
if ( !empty($format) ) {
$format = sanitize_key($format);
if ( 'standard' == $format || !in_array( $format, array_keys( get_post_format_slugs() ) ) )
$format = '';
else
$format = 'post-format-' . $format;
}
return wp_set_post_terms($post->ID, $format, 'post_format');
}
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