Smarty Manual
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count_words

This is used to count the number of words in a variable.

Example 5-7. count_words

<?php

$smarty->assign('articleTitle', 'Dealers Will Hear Car Talk at Noon.');

?>

Where template is: 

{$articleTitle}
{$articleTitle|count_words}

This will output: 

Dealers Will Hear Car Talk at Noon.
7

See also count_characters, count_paragraphs and count_sentences.

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