How to format plaintext like a book/magazine with PHP?

Question

I have:

This is a test string. Cool, huh?

I want:

This is a te-
st string. C-
ool, huh?

That is, each line is

Answer 1

Here's some code you should be able to work with, using some sort of hyphenation library. This code uses a fake 3-character hyphenation function. You can see it in action at https://www.tehplayground.com/eNtxiMTeXj16oPkT - it took me about 10 minutes to write this, so it was, in fact, trivial - contrary to what you wrote in the now deleted thread.

0 ? " " : "") . $word;
        else {
            $syllables = FAKE_hyphenate($word);
            $syllables[0] = " ".$syllables[0];
            $syl_count=0;
            while ($syllables) {
                $syllable = array_shift($syllables);
                if (strlen($line)+strlen($syllable)<=$line_length-1) {
                    $line .= $syllable;
                    $syl_count++;
                } else {
                    array_unshift($syllables,$syllable);
                    break;
                }
            }
            if ($syl_count>0)
                $line .= "-";
            $syllables[0] = str_replace(" ","",$syllables[0]);
            array_unshift($words,implode("",$syllables));
            $lines[] = $line;
            $line = "";
        }
    }
    $lines[] = $line;
    return implode("\n",$lines);
}

echo hyphenate_text($loremipsum,25);