Listing 11.5. Klasa myString z pliku lib/myString.class.php
<?php
class myString {
    public static function string2multiline_yml($napis, $ile = 4)
    {
        $tab = preg_split('/\r?\n/', $napis);
        $wynik = array();
        foreach ($tab as $l) {
            $wynik[] = str_repeat(' ', $ile) . trim($l) . "\r\n";
        }
        return "|\r\n" . implode('', $wynik);
    }
}