ucwords for a string without space?

[etrader]

I want to capitalized the first words in a sentence. This is fairly done by ucwords() but it will consider words after a space. I have a string with the form of

$str="word1-word2_word3";

how I capitize it to

$str="Word1-Word2_Word3";

?

[PFMaBiSmAd]

I would use preg_replace with the 'e' modifier to get it to call ucfirst for each word found.

 

[PFMaBiSmAd]

Specifically -

<?php
$str="word1-word2_word3 word4";
$str = preg_replace("/([^\W_]+)/e", "ucfirst('\\1')", $str);
echo $str;
?>

[etrader]

Thanks for you handy idea