There is only one default for this function, called 'fields' and by default is set to 'all'. There are other defaults that can be overridden in wp_get_object_terms().
Parameters
$post_idintoptional
The Post ID. Does not default to the ID of the global $post. Default 0.Default: 0
$argsarrayoptional
Tag query parameters. Default empty array. See WP_Term_Query::__construct() for supported arguments.Default: array()
Return
array|WP_Error
Array of WP_Term objects on success or empty array if no tags were found. WP_Error object if 'post_tag' taxonomy doesn't exist.
Signature, return type and hooks compared across 5 parsed releases.
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