If you pass the $tag parameter an object, which is assumed to be the tag row object retrieved from the database, it will cache the tag data. If you pass $tag an integer of the tag ID, then that tag will be retrieved from the database, if it isn't already cached, and passed back. If you look at get_term(), both types will be passed through several filters and finally sanitized based on the $filter parameter value.
Parameters
$tagint|WP_Term|object
A tag ID or object.
$outputstringoptional
The required return type. One of OBJECT, ARRAY_A, or ARRAY_N, which correspond to a WP_Term object, an associative array, or a numeric array, respectively. Default OBJECT.Default: OBJECT
$filterstringoptional
How to sanitize tag fields. Default 'raw'.Default: 'raw'
Return
WP_Term|array|WP_Error|null
Tag data in type defined by $output parameter. WP_Error if $tag is empty, null if it does not exist.
Uses · 1
get_term()Gets all term data from database by term ID.
Signature, return type and hooks compared across 5 parsed releases.
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