'; $text = ' test [i]test[/i] test [b]test[/b] test [u]test[/u] test [i]test test'; echo $text . '
'; echo htmlentities($text) . '

'; $text = preg_replace('!\[(i|b|u)\](.*?)\[/\\1\]!is', '<\\1>\\2', $text); echo $text . '
'; echo htmlentities($text) . '

'; echo ''; ?>