wrap.php

<?php

function wrap($text, $chunkSize) {
    return join("\n", str_split($text, $chunkSize));
}

Wrapper.java

package codingdojo;

import com.google.common.base.Splitter;

public class Wrapper {
    public static String wrap(String text, int chunkSize) {
        return String.join("\n", Splitter.fixedLength(chunkSize).split(text));
    }
}