February 12, 2011 
Definition:
function &get_tag( $tag, $output = OBJECT, $filter = 'raw' ) {}
Retrieve post tag by tag ID or tag object.
If you pass the $tag parameter an object, which is assumed to be the tag row object retrieved the database. It will cache the tag data.
Parameters
- int|object $tag
- string $output: Optional. Constant OBJECT, ARRAY_A, or ARRAY_N
- string $filter: Optional. Default is raw or no WordPress defined filter will applied.
Return values
returns:Return type based on $output value.
Source code
function &get_tag( $tag, $output = OBJECT, $filter = 'raw' ) {
return get_term( $tag, 'post_tag', $output, $filter );
}
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A HitchHackers guide through WordPress 
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