displaying certain number of character

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$words= "If length is given and is negative,
 then that many characters will be omitted from
 the end of string (after the start position has
 been calculated when a start is negative). If start
 denotes a position beyond this truncation, an empty
 string will be returned. ";

 echo substr($words, 0, 50).".......";
 ?>


I have been using this but how can I make sure I do not split a word in
half? - Finishing on a <space> would probably do it.


R.

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