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Shortens a subject and adds " ..." to the end of it (if needed).

string shorten_subject (string $subject, int $len)

Expected type: String
Description: The subject (of the topic, post or PM) that should be shortened

Expected type: Integer
Description: How long the shortened subject should be before "..." is appended.

Expected type: String
Description: The shortened version of a subject, or the actual subject if the subject isn't longer than $len

In 1.1 Beta 3 Public through 1.1 RC2, uses strlen() and substr()
Starting with 1.1 RC3, relies on the functions specified by $func['strlen'] and $func['substr']
$func is used for internationalization stuff, and more info on that will be added at a later date
Only shortens the subject if $subject is longer than $len