February 12, 2011 
Definition:
function &get_categories( $args = '' ) {}
Retrieve list of category objects.
If you change the type to ‘link’ in the arguments, then the link categories will be returned instead. Also all categories will be updated to be backwards compatible with pre-2.3 plugins and themes.
Parameters
- string|array $args: Optional. Change the defaults retrieving categories.
Return values
returns:List of categories.
Defined filters
- get_categories_taxonomy
apply_filters( 'get_categories_taxonomy', $args['taxonomy'], $args )
Source code
function &get_categories( $args = '' ) {
$defaults = array( 'taxonomy' => 'category' );
$args = wp_parse_args( $args, $defaults );
$taxonomy = apply_filters( 'get_categories_taxonomy', $args['taxonomy'], $args );
// Back compat
if ( isset($args['type']) && 'link' == $args['type'] ) {
_deprecated_argument( __FUNCTION__, '3.0', '' );
$taxonomy = $args['taxonomy'] = 'link_category';
}
$categories = (array) get_terms( $taxonomy, $args );
foreach ( array_keys( $categories ) as $k )
_make_cat_compat( $categories[$k] );
return $categories;
}
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A HitchHackers guide through WordPress 
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