Detailed usage of smarty truncate. What should I do?

Detailed usage of the truncate of smarty ..... Ask: What is the usage of smarty's truncate? Why is the difference between the length of the captured characters and the actual captured characters so far ?? Template code: {$ title | truncate: 15} & lt; br/& gt; PHP handler code: $ smarty-truncate detailed usage .....
Ask:

What is the usage of smarty's truncate? Why is the difference between the length of the captured characters and the actual captured characters so far ??

Template code:
{$ Title | truncate: 15}


PHP processing code:
$ Smarty-> assign ("title", "what will you do if you had more money? ");

What is displayed: what will...

Didn't it take 15 characters to intercept?

Thank you ..

------ Solution --------------------
By default, smarty captures the end of a word.
If you want to accurately intercept the number of characters, change the third parameter to "true"

HTML code

{$ Title | truncate: 15: "...": true}