how to limit search box words in php

php How to limit words in a search box? I want limit words within 30 words and do not broken the phrase.

I think it should combine strlen and ex开发者_JAVA技巧plode, but how to? and how to notice the custom when he is typing words?

Thanks.

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That's javascript related not PHP.

You may want to use jQuery and attach an onChange event.

If you need the PHP script it's:

echo implode( ' ', array_slice(explode(' ',$search),0,30) ); //> Expensive

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You can check PHP's str_word_count function . You can count words .

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$string = preg_replace('/^((?:\s*\w+){0,30}).*$/s', '$1', $string);