nl2br and nl2p

<?php


$str = "Welcome to 
China
";

echo nl2br($str);

function nl2p($text) {
    return "<p>" . str_replace("\n", "</p><p>", $text) . "</p>";
}

echo nl2p($str);

Welcome to <br />
China<br />
<p>Welcome to </p><p>China</p><p></p>