February 11, 2011 
Definition:
function add_comment_meta($comment_id, $meta_key, $meta_value, $unique = false) {}
Add meta data field to a comment.
Parameters
- int $comment_id: Comment ID.
- string $meta_key: Metadata name.
- mixed $meta_value: Metadata value.
- bool $unique: Optional, default is false. Whether the same key should not be added.
Return values
returns:False for failure. True for success.
Source code
function add_comment_meta($comment_id, $meta_key, $meta_value, $unique = false) {
return add_metadata('comment', $comment_id, $meta_key, $meta_value, $unique);
}
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A HitchHackers guide through WordPress 
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