0 && $p[$c] == $p[$c - 1] ? '': $p[$c]); }, array_keys($p))); } echo unique("Banana") . "\n"; // Banana echo unique("Arara") . "\n"; // Arara echo unique("assassinos") . "\n"; // asasinos echo unique("Marreco") . "\n"; // Mareco echo unique("Elllizabettth") . "\n"; // Elizabeth echo unique("FooBaaar") . "\n"; // FoBar echo unique("Woow") . "\n"; // Wow echo unique("baazz") . "\n"; // baz